hydroxide /haɪˈdɹɒks.aɪd/ noun2 •A univalent anion (OH⁻) based on the hydroxyl functional group.A sample of carbon removed from the ocean in the solid form of calcium carbonate and magnesium hydroxide from UCLA's SeaChange program -- now known as Equatic -- in 2023. — 2024 •Any substance containing such an anion. formshydroxides
