hydroxide hydroxamino • hydroxide ion · · · Info · Definitions · Synonyms · Characters · · hydroxide · · Text Latin · · Script 9 · · Length 3 · · Syllables Definitions · · · (noun) a compound of an oxide with water. Synonyms: hydrated oxide. · · Noun Definition 1 (noun) a chemical compound containing the hydroxyl group. · · Noun Definition 2 Synonyms · · · hydrated oxide · · Synonym 1 Characters · · d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 o latin small letter o U+006F r latin small letter r U+0072 x latin small letter x U+0078 y latin small letter y U+0079