hydroxide

noun

hy·​drox·​ide hī-ˈdräk-ˌsīd 

1

: the monovalent anion OH⁻ consisting of one atom of hydrogen and one of oxygen

called also hydroxide ion

2

: an ionic compound of hydroxide with an element or group

Examples of hydroxide in a Sentence

Recent Examples on the Web

In particular, producing one ton of lithium hydroxide monohydrate generates about 7-10 tons of a byproduct called delithiated β-spodumene (DβS), but its uses haven't been well understood thus far. —Abhimanyu Ghoshal, New Atlas, 27 Nov. 2025

It was found that hydroxide ions shifted the absorption onset to energies different from those in pure ice. —Mrigakshi Dixit, Interesting Engineering, 21 Nov. 2025

Antacids generally contain aluminum hydroxide, calcium carbonate, sodium bicarbonate, or bismuth subsalicylate. —Ann Pietrangelo, Verywell Health, 4 Sep. 2025

The new high-pressure acid leaching smelter will produce 66,000 tons of nickel in mixed hydroxide precipitate each year when completed, using nickel ore from Vale Indonesia’s mines. —Yessar Rosendar, Forbes.com, 28 Aug. 2025

Word History

Etymology

International Scientific Vocabulary

First Known Use

1851, in the meaning defined at sense 1

Phrases Containing hydroxide

• ammonium hydroxide
• calcium hydroxide
• magnesium hydroxide
• potassium hydroxide
• sodium hydroxide

Rhymes for hydroxide

• monoxide
• tetroxide

Kids Definition

hydroxide

noun

hy·​drox·​ide hī-ˈdräk-ˌsīd 

: a negatively charged ion consisting of one atom of oxygen and one atom of hydrogen

Medical Definition

hydroxide

noun

hy·​drox·​ide hī-ˈdräk-ˌsīd 

1

: the monovalent anion OH⁻ consisting of one atom of hydrogen and one of oxygen

called also hydroxide ion

2

: an ionic compound of hydroxide with an element or group