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

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

Context: Lithium carbonate is a measure of how much of the mineral is in derivatives like lithium chloride and lithium hydroxide, which are processed for use in rechargeable batteries. —Worth Sparkman, Axios, 7 Aug. 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

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