H2O

[Saaropean]

Chemistry: H₂O

Dutch: water
English: water
German: Wasser
Icelandic: vatn
Luxembourgish: Waasser
Swedish: vatten

Catalan: aigua
French: eau [o]
Italian: àcqua
Portuguese: água
Romanian: apă
Spanish: agua

Russian: вода (voda)

Greek: νερό (nero)

Chinese: 水 (shuǐ)

Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ]

[Liisi]

Chemistry: H₂O

Dutch: water
English: water
German: Wasser
Icelandic: vatn
Luxembourgish: Waasser
Swedish: vatten

Catalan: aigua
French: eau [o]
Italian: àcqua
Portuguese: água
Romanian: apă
Spanish: agua

Russian: вода (voda)

Lithuanian: vanduo

Greek: νερό (nero)

Finnish: vesi

Chinese: 水 (shuǐ)

Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ]

[kibo]

Chemistry: H2O

Dutch: water
English: water
German: Wasser
Icelandic: vatn
Luxembourgish: Waasser
Swedish: vatten

Catalan: aigua
French: eau [o]
Galician: auga / agua
Italian: àcqua
Portuguese: água
Romanian: apă
Spanish: agua

Bulgarian: вода (voda)
Croatian: voda
Russian: вода (voda)
Serbian: вода [voda]

Lithuanian: vanduo

Greek: νερό (nero)

Finnish: vesi

Chinese: 水 (shuǐ)

Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ]

[Guillem]

Dutch: water
English: water
German: Wasser
Icelandic: vatn
Luxembourgish: Waasser
Swedish: vatten

Catalan: aigua
French: eau [o]
Galician: auga / agua
Italian: àcqua
Portuguese: água
Romanian: apă
Spanish: agua

Bulgarian: вода (voda)
Croatian: voda
Russian: вода (voda)
Serbian: вода [voda]

Lithuanian: vanduo

Greek: νερό (nero)

Finnish: vesi

Chinese: 水 (shuǐ)

Japanese: 水　mizu (kunyomi reading), sui (onyomi reading)

Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ]

[Guillem]

Dutch: water
English: water
German: Wasser
Icelandic: vatn
Luxembourgish: Waasser
Swedish: vatten

Catalan: aigua
French: eau [o]
Galician: auga / agua
Italian: àcqua
Portuguese: água
Romanian: apă
Spanish: agua

Bulgarian: вода (voda)
Croatian: voda
Russian: вода (voda)
Serbian: вода [voda]

Lithuanian: vanduo

Greek: νερό (nero)

Finnish: vesi

Chinese: 水 (shuǐ)

Turkish: su

Japanese: 水　mizu (kunyomi reading), sui (onyomi reading)

Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ]

[Kyr]

Chemistry: H2O

Old Greek: ύδωρ (hydor)

Dutch: water
English: water
German: Wasser
Icelandic: vatn
Luxembourgish: Waasser
Swedish: vatten

Catalan: aigua
French: eau [o]
Galician: auga / agua
Italian: àcqua
Portuguese: água
Romanian: apă
Spanish: agua

Bulgarian: вода (voda)
Croatian: voda
Russian: вода (voda)
Serbian: вода [voda]

Lithuanian: vanduo

Greek: νερό (nero)

Finnish: vesi

Chinese: 水 (shuǐ)

Turkish: su

Japanese: 水　mizu (kunyomi reading), sui (onyomi reading)

Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ][/quote]

[Guillem]

Chemistry: H2O

Dutch: water
English: water
German: Wasser
Icelandic: vatn
Luxembourgish: Waasser
Swedish: vatten

Catalan: aigua
French: eau [o]
Galician: auga / agua
Italian: àcqua
Portuguese: água
Romanian: apă
Spanish: agua

Bulgarian: вода (voda)
Croatian: voda
Czech: voda
Russian: вода (voda)
Serbian: вода [voda]

Lithuanian: vanduo

Old Greek: ύδωρ (hydor)
Greek: νερό (nero)

Finnish: vesi

Chinese: 水 (shuǐ)

Turkish: su

Japanese: 水　mizu (kunyomi reading), sui (onyomi reading)

Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ]

[baja]

Chemistry: H2O

Dutch: water
English: water
German: Wasser
Icelandic: vatn
Luxembourgish: Waasser
Swedish: vatten

Catalan: aigua
French: eau [o]
Galician: auga / agua
Italian: àcqua
Portuguese: água
Romanian: apă
Spanish: agua

Bulgarian: вода (voda)
Croatian: voda
Czech: voda
Polish: woda
Russian: вода (voda)
Serbian: вода [voda]

Lithuanian: vanduo

Old Greek: ύδωρ (hydor)
Greek: νερό (nero)

Finnish: vesi

Chinese: 水 (shuǐ)

Turkish: su

Japanese: 水　mizu (kunyomi reading), sui (onyomi reading)

Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ]

Arabic:ماء [maa']

[Nukalurk]

Chemistry: H2O

Dutch: water
English: water
German: Wasser
Icelandic: vatn
Luxembourgish: Waasser
Swedish: vatten

Catalan: aigua
French: eau [o]
Galician: auga / agua
Italian: àcqua
Latin: aqua
Portuguese: água
Romanian: apă
Spanish: agua

Belorussian: вада [vada]
Bulgarian: вода (voda)
Croatian: voda
Czech: voda
Polish: woda
Russian: вода (voda)
Serbian: вода [voda]
Slovakian: voda

Lithuanian: vanduo

Greek: νερό (nero)
Old Greek: ύδωρ (hydor)

Finnish: vesi

Chinese: 水 (shuǐ)

Turkish: su

Japanese: 水　mizu (kunyomi reading), sui (onyomi reading)

Esperanto: akvo
Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ][/quote]

[Mantaz]

Chemistry: H2O

Old Greek: ύδωρ (hydor)

Dutch: water
English: water
German: Wasser
Icelandic: vatn
Luxembourgish: Waasser
Swedish: vatten

Catalan: aigua
French: eau [o]
Galician: auga / agua
Italian: àcqua
Portuguese: água
Romanian: apă
Spanish: agua

Bulgarian: вода (voda)
Croatian: voda
Russian: вода (voda)
Serbian: вода [voda]

Lithuanian: vanduo
Latvian: ūdens

Greek: νερό (nero)

Estonian: vesi
Finnish: vesi

Chinese: 水 (shuǐ)

Turkish: su

Japanese: 水　mizu (kunyomi reading), sui (onyomi reading)

Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ][/quote]

[Nukalurk]

Chemistry: H2O

Dutch: water
English: water
German: Wasser
Icelandic: vatn
Luxembourgish: Waasser
Swedish: vatten

Catalan: aigua
French: eau [o]
Galician: auga / agua
Italian: àcqua
Latin: aqua
Portuguese: água
Romanian: apă
Spanish: agua

Belorussian: вада [vada]
Bulgarian: вода (voda)
Croatian: voda
Czech: voda
Polish: woda
Russian: вода (voda)
Serbian: вода [voda]
Slovakian: voda

Latvian: ūdens
Lithuanian: vanduo
Sudovian: undan

Greek: νερό (nero)
Old Greek: ύδωρ (hydor)

Estonian: vesi
Finnish: vesi

Chinese: 水 (shuǐ)

Arabic:ماء [maa']

Turkish: su

Japanese: 水　mizu (kunyomi reading), sui (onyomi reading)

Esperanto: akvo
Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ]

[kibo]

Dutch: water
English: water
German: Wasser
Icelandic: vatn
Luxembourgish: Waasser
Swedish: vatten

Catalan: aigua
French: eau [o]
Galician: auga / agua
Italian: àcqua
Latin: aqua
Portuguese: água
Romanian: apă
Spanish: agua

Belorussian: вада [vada]
Bulgarian: вода (voda)
Croatian: voda
Czech: voda
Macedonian: вода (voda)
Polish: woda
Russian: вода (voda)
Serbian: вода [voda]
Slovakian: voda

Latvian: ūdens
Lithuanian: vanduo
Sudovian: undan

Greek: νερό (nero)
Old Greek: ύδωρ (hydor)

Finnish: vesi
Estonian: vesi

Chinese: 水 (shuǐ)

Turkish: su

Japanese: 水　mizu (kunyomi reading), sui (onyomi reading)

Arabic:ماء [maa']
Hebrew: מים [mayim]

Esperanto: akvo
Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ]
Lingua Franca Nova: acua

[kibo]

Dutch: water
English: water
German: Wasser
Icelandic: vatn
Luxembourgish: Waasser
Swedish: vatten

Catalan: aigua
French: eau [o]
Galician: auga / agua
Italian: àcqua
Latin: aqua
Portuguese: água
Romanian: apă
Spanish: agua

Belorussian: вада [vada]
Bulgarian: вода (voda)
Croatian: voda
Czech: voda
Macedonian: вода (voda)
Polish: woda
Russian: вода (voda)
Serbian: вода [voda]
Slovakian: voda

Latvian: ūdens
Lithuanian: vanduo
Sudovian: undan

Greek: νερό (nero)
Old Greek: ύδωρ (hydor)

Finnish: vesi
Estonian: vesi

Chinese: 水 (shuǐ)

Turkish: su

Japanese: 水　mizu (kunyomi reading), sui (onyomi reading)

Arabic:ماء [maa']
Hebrew: מים [mayim]

Esperanto: akvo
Interlingua: aqua
Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ]
Lingua Franca Nova: acua

[ego]

Dutch: water
English: water
German: Wasser
Icelandic: vatn
Luxembourgish: Waasser
Swedish: vatten

Catalan: aigua
French: eau [o]
Galician: auga / agua
Italian: àcqua
Latin: aqua
Portuguese: água
Romanian: apă
Spanish: agua

Belorussian: вада [vada]
Bulgarian: вода (voda)
Croatian: voda
Czech: voda
Macedonian: вода (voda)
Polish: woda
Russian: вода (voda)
Serbian: вода [voda]
Slovakian: voda

Latvian: ūdens
Lithuanian: vanduo
Sudovian: undan

Greek: νερό (nero)
Old Greek: ύδωρ (hydor)

Finnish: vesi
Estonian: vesi

Chinese: 水 (shuǐ)

Turkish: su

Japanese: 水　mizu (kunyomi reading), sui (onyomi reading)

Arabic:ماء [maa']
Hebrew: מים [mayim]

Esperanto: akvo
Interlingua: aqua
Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ]
Lingua Franca Nova: acua

All Polynesian languages: vai
Malagasy: rano

[CoBB]

Dutch: water
English: water
German: Wasser
Icelandic: vatn
Luxembourgish: Waasser
Swedish: vatten

Catalan: aigua
French: eau [o]
Galician: auga / agua
Italian: àcqua
Latin: aqua
Portuguese: água
Romanian: apă
Spanish: agua

Belorussian: вада [vada]
Bulgarian: вода (voda)
Croatian: voda
Czech: voda
Macedonian: вода (voda)
Polish: woda
Russian: вода (voda)
Serbian: вода [voda]
Slovakian: voda

Latvian: ūdens
Lithuanian: vanduo
Sudovian: undan

Greek: νερό (nero)
Old Greek: ύδωρ (hydor)

Finnish: vesi
Estonian: vesi
Hungarian: víz

Chinese: 水 (shuǐ)

Turkish: su

Japanese: 水　mizu (kunyomi reading), sui (onyomi reading)

Arabic:ماء [maa']
Hebrew: מים [mayim]

Esperanto: akvo
Interlingua: aqua
Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ]
Lingua Franca Nova: acua

All Polynesian languages: vai
Malagasy: rano

[Kyr]

I want to add something about the modern greek word νερό "nero" = water. It is not some kind of innovation, as one could think, but it comes also from old greek (νερόν, νηρόν, neron), which means also water (like Νηρεύς "Nereus"= a god of the sea, Νηρηίδες "Nereids" = nymphs of the sea).

Also, I think that the/a word for water in sanskrit is "nira"; in tamil "nir" (long "i"), too; also that "naaru" means "river" in akkadian.

Yet, the "classical" name for "water" in greek is ύδωρ "hydor" (therefore all the "hydro-" prefixes).

[frank74]

Danish: vand
Dutch: water
English: water
Frisian (West): wetter
German: Wasser
Icelandic: vatn
Low Saxon: Water/ Woter
Luxembourgish: Waasser
Norwegian (bokmål): vann
Swedish: vatten

Catalan: aigua
French: eau [o]
Galician: auga / agua
Italian: àcqua
Latin: aqua
Occitan (Béarnais): aiga
Portuguese: água
Romanian: apă
Spanish: agua

Belorussian: вада [vada]
Bulgarian: вода (voda)
Croatian: voda
Czech: voda
Macedonian: вода (voda)
Polish: woda
Russian: вода (voda)
Serbian: вода [voda]
Slovakian: voda
Upper Sorbian: woda

Latvian: ūdens
Lithuanian: vanduo
Sudovian: undan

Greek: νερό (nero)
Old Greek: ύδωρ (hydor)

Finnish: vesi
Estonian: vesi
Hungarian: víz

Chinese: 水 (shuǐ)

Turkish: su

Japanese: 水　mizu (kunyomi reading), sui (onyomi reading)

Arabic:ماء [maa']
Hebrew: מים [mayim]

Esperanto: akvo
Interlingua: aqua
Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ]
Lingua Franca Nova: acua

All Polynesian languages: vai
Malagasy: rano

[Psi-Lord]

Chemistry: H₂O

Danish: vand
Dutch: water
English: water
Frisian (West): wetter
German: Wasser
Icelandic: vatn
Low Saxon: Water/ Woter
Luxembourgish: Waasser
Norwegian (bokmål): vann
Swedish: vatten

Catalan: aigua
French: eau
Galician: auga / agua
Italian: àcqua
Latin: aqua
Occitan (Béarnais): aiga
Portuguese: água
Romanian: apă
Spanish: agua

Belorussian: вада [vada]
Bulgarian: вода [voda]
Croatian: voda
Czech: voda
Macedonian: вода [voda]
Polish: woda
Russian: вода [voda]
Serbian: вода [voda]
Slovakian: voda
Upper Sorbian: woda

Latvian: ūdens
Lithuanian: vanduo
Sudovian: undan

Greek: νερό [neró]
Old Greek: ὕδωρ (ύδωρ) [hýdōr]

Finnish: vesi
Estonian: vesi
Hungarian: víz

Chinese: 水 [shuǐ]

Turkish: su

Japanese: 水　[SUI, mizu]

Korean: 물 [mul]

Khmer: ទឹក [tœ̆k]

Thai: น้ำ [nam]

Tupi: y

Arabic:ماء [maa']
Hebrew: מים [mayim]

Esperanto: akvo
Interlingua: aqua
Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ]
Lingua Franca Nova: acua

All Polynesian languages: vai

Malagasy: rano

Scottish Gaelic: uisge

[DelBoy]

Chemistry: H2O

Danish: vand
Dutch: water
English: water
Frisian (West): wetter
German: Wasser
Icelandic: vatn
Low Saxon: Water/ Woter
Luxembourgish: Waasser
Norwegian (bokmål): vann
Swedish: vatten

Catalan: aigua
French: eau
Galician: auga / agua
Italian: àcqua
Latin: aqua
Occitan (Béarnais): aiga
Portuguese: água
Romanian: apă
Spanish: agua

Belorussian: вада [vada]
Bulgarian: вода [voda]
Croatian: voda
Czech: voda
Macedonian: вода [voda]
Polish: woda
Russian: вода [voda]
Serbian: вода [voda]
Slovakian: voda
Upper Sorbian: woda

Latvian: ūdens
Lithuanian: vanduo
Sudovian: undan

Greek: νερό [neró]
Old Greek: ὕδωρ (ύδωρ) [hýdōr]

Finnish: vesi
Estonian: vesi
Hungarian: víz

Chinese: 水 [shuǐ]

Turkish: su

Japanese: 水　[SUI, mizu]

Korean: 물 [mul]

Khmer: ទឹក [tœ̆k]

Thai: น้ำ [nam]

Tupi: y

Arabic:ماء [maa']
Hebrew: מים [mayim]

Esperanto: akvo
Interlingua: aqua
Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ]
Lingua Franca Nova: acua

All Polynesian languages: vai

Malagasy: rano

Scottish Gaelic: uisge
Irish: uisce (from which comes whiskey!)

[Zaduma]

Chemistry: H₂O

Danish: vand
Dutch: water
English: water
Frisian (West): wetter
German: Wasser
Icelandic: vatn
Low Saxon: Water/ Woter
Luxembourgish: Waasser
Norwegian (bokmål): vann
Swedish: vatten

Catalan: aigua
French: eau
Galician: auga / agua
Italian: àcqua
Latin: aqua
Occitan (Béarnais): aiga
Portuguese: água
Romanian: apă
Spanish: agua

Belorussian: вада [vada]
Bulgarian: вода [voda]
Croatian: voda
Czech: voda
Kashubian: wòda
Macedonian: вода [voda]
Polabian: wôdă
Polish: woda
Russian: вода [voda]
Serbian: вода [voda]
Slovakian: voda
Upper Sorbian: woda

Latvian: ūdens
Lithuanian: vanduo
Sudovian: undan

Greek: νερό [neró]
Old Greek: ὕδωρ (ύδωρ) [hýdōr]

Finnish: vesi
Estonian: vesi
Hungarian: víz

Chinese: 水 [shuǐ]

Turkish: su

Japanese: 水　[SUI, mizu]

Korean: 물 [mul]

Khmer: ទឹក [tœ̆k]

Thai: น้ำ [nam]

Tupi: y

Arabic:ماء [maa']
Hebrew: מים [mayim]

Esperanto: akvo
Interlingua: aqua
Klingon: bIQ [bɪqχ / mbɪqχ / mɪqχ]
Lingua Franca Nova: acua
Wenedyk: akwa

All Polynesian languages: vai

Malagasy: rano

Scottish Gaelic: uisge
Irish: uisce (from which comes whiskey!)