calcium hydroxide

noun

: a white crystalline strong alkali Ca(OH)₂ that is used especially to make mortar and plaster and to soften water

Examples of calcium hydroxide in a Sentence

Recent Examples on the Web

Acid can be used to leach elements like calcium out, then a chemical or energetic process precipitates that calcium as calcium hydroxide. — Scott K. Johnson, ArsTechnica, 15 May 2026

Water and glucomannan make up the bulk of the noodle, with a calcium additive, like pickling lime or calcium hydroxide, added to keep the shape of the noodle. — Bestreviews, Mercury News, 23 Jan. 2026

This happens when the salt combines with the calcium hydroxide in the concrete, which then expands and causes micro-fractures throughout the concrete. — Kamron Sanders, The Spruce, 23 Jan. 2026

To make the electrodes, the researchers first shredded bottles into 2-millimeter grains and then added powdered calcium hydroxide. — Perri Thaler, IEEE Spectrum, 22 Oct. 2025

Word History

First Known Use

1872, in the meaning defined above

Rhymes for calcium hydroxide

• monoxide
• tetroxide

Kids Definition

calcium hydroxide

noun

: a white compound in the form of crystals that is used especially in making mortar and plaster and in softening water

Medical Definition

calcium hydroxide

noun

: a strong alkali Ca(OH)₂ commonly sold in water solution or as an ingredient of bleaching powder see limewater, soda lime