7 letters · 14 points in Scrabble
adjective containing combined water (especially water of crystallization as in a hydrate)
originFrom Ancient Greek ὑδροῦς (hudroûs), from the combining form of ὕδωρ (húdōr, “water”) + -οῦς (-oûs, “-ous, -ful”). Equivalent to hydro- + -ous. Doublet of Otranto and Hydruntum.
Etymology from Wiktionary, CC BY-SA 3.0