''lactose'' ▫ᴱᴺ｜Definition｜1st｜20260125123911-00-⌔

lactose - Wiktionary, the free dictionary

English

Noun

lactose (countable and uncountable, plural lactoses)

• (biochemistry) The disaccharide sugar of milk and dairy products, C${}_{12}$ H${}_{22}$ O${}_{11}$, a product of glucose and galactose used as a food and in medicinal compounds.

Etymology

Borrowed from French lactose, from Latin lac (“milk”) +‎ -ose (derivation of glucose). Coined by French chemist Marcelin Berthelot.

Pronunciation

• (UK) IPA: /ˈlæk.təʊs/, /ˈlæk.təʊz/
• Audio (Southern England): 🔊
• Audio (Southern England): 🔊
• (US) IPA: /ˈlæk.toʊs/

Printed 2026-06-28.

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