Origin: Greek prefix hydro-
Hydroxide has 3 different meanings across 1 category:
a compound of an oxide with water
"The chemist noted that when sodium oxide reacts with moisture in the air, it forms solid sodium hydroxide through hydration rather than direct synthesis."
a chemical compound containing the hydroxyl group
"The sodium hydroxide in the lab bottle is actually a chemical compound containing the hydroxyl group that makes it highly caustic."
An univalent anion (OH⁻) based on the hydroxyl functional group.
"The sodium hydroxide solution in the lab bench is a strong base containing the hydroxide anion that neutralizes the acid spill."