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

Once completed, the smelter will produce 90,000 tonnes of mixed hydroxide precipitate, a crucial material for making EV batteries. —Yessar Rosendar, Forbes, 26 Feb. 2025

For example, some ingredients in toothpaste, such as calcium hydroxide or aluminum hydroxide, can reduce the effectiveness of mouthwash. —Heather Jones, Verywell Health, 5 Jan. 2025

Popular antacids are Gaviscon (alginic acid/sodium bicarbonate/aluminum hydroxide/magnesium carbonate), Mylanta (aluminum hydroxide/magnesium hydroxide), Rolaids (calcium carbonate/magnesium hydroxide), and Tums (calcium carbonate). —Patricia Weiser, Pharmd, Verywell Health, 2 Oct. 2024

The active ingredients include aluminum hydroxide and magnesium hydroxide. —Alex Yampolsky, Verywell Health, 11 Sep. 2024

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