Hydroxyl
Pronunciation : Hy*drox"yl
Part of Speech : n.
Etymology : [Hydro-, 2 + oxygen + -yl.] (Chem.)
Definition : Defn: A compound radical, or unsaturated group, HO, consisting of one atom of hydrogen and one of oxygen. It is a characteristic part of the hydrates, the alcohols, the oxygen acids, etc.
Source : Webster's Unabridged Dictionary, 1913