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

Lithium chemicals such as lithium hydroxide and lithium carbonate are key ingredients in many rechargeable batteries used in electric cars and energy storage systems. —Neetika Walter, Interesting Engineering, 20 Apr. 2026

The facility is the first of its kind in North America, converting spodumene ore directly into battery-grade lithium hydroxide. —John Pacenti, USA Today, 15 Apr. 2026

This inclusion was found to contain roughly 1–1.5 percent water by weight, not as liquid but in the form of hydroxide ions bound within the mineral’s structure. —Divya Dubey, Encyclopedia Britannica, 31 Mar. 2026

Sibanye, a global top three platinum metals (PGM) miner, is currently developing the Keliber project in Finland, a mine intended to produce battery-grade lithium hydroxide from local ore. —Tiisetso Motsoeneng, semafor.com, 30 Mar. 2026

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