eau is feminine in French.
water, a liquid that is transparent, colorless, odorless, and tasteless in its pure form, the primary constituent of lakes, rivers, seas, and oceans; In particular, rain; the chemical compound with molecular formula H₂O existing in the form of ice, liquid water or steam; Natural liquid quantities or expanses; Fluids such as sweat, formed and found in the body of man or animal
“Il buvait un verre d’eau fraîche.” — He drank a cool glass of water.
Inherited from Middle French eau, eaue, from Old French ewe, euwe, egua (“water”), from Latin aqua (“water”), from Proto-Indo-European *h₂ekʷeh₂ (“water, flowing water”), related to Frankish *ahu ~ ahwā (“stream, water”). See also English ea (“watercourse, river”). Cognates See also Angevin ave, eive, ève, ieau, Aragonese augua, Aromanian apã, Asturian agua, Bourbonnais-Berrichon aïe, aigue, Bourguignon eâ, Burgundian eai, Catalan aigua, Champenois aive, ève, Corsican acqua, Franc-Comtois âve, F