Standard Lemma guide

lactase

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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  • CMU ARPABET: L AE1 K T EY2 S Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

A β-galactosidase enzyme that is involved in the hydrolysis of the disaccharide lactose into constituent galactose and glucose monomers.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: biochemistry, biology, chemistry, microbiology, natural-sciences, organic-chemistry, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

any of a group of enzymes (trade name Lactaid) that hydrolyze lactose to glucose and galactose

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: Lactaid

Antonyms: none provided

Broader terms: disaccharidase

History

Etymology

From lacto- + -ase.

Across languages

Translations

24 source translations are retained for this English entry.

  • Catalan: lactasa — A β-galactosidase enzyme
  • Chinese Mandarin: 乳糖酶 (rǔtángméi) — A β-galactosidase enzyme
  • Czech: laktáza — A β-galactosidase enzyme
  • Dutch: lactase — A β-galactosidase enzyme
  • Esperanto: laktazo — A β-galactosidase enzyme
  • Finnish: laktaasi — A β-galactosidase enzyme
  • French: lactase — A β-galactosidase enzyme
  • German: Laktase — A β-galactosidase enzyme
  • German: Lactase — A β-galactosidase enzyme
  • Hungarian: laktáz — A β-galactosidase enzyme
  • Icelandic: laktasi — A β-galactosidase enzyme
  • Ido: laktazo — A β-galactosidase enzyme
  • Italian: lattasi — A β-galactosidase enzyme
  • Māori: whākōkī ngako waiū — A β-galactosidase enzyme
  • Māori: whākōkī reihuka — A β-galactosidase enzyme
  • Māori: whākōkī hukawaiū — A β-galactosidase enzyme
  • Polish: laktaza — A β-galactosidase enzyme
  • Portuguese: lactase — A β-galactosidase enzyme
  • Romanian: lactază — A β-galactosidase enzyme
  • Russian: лакта́за (laktáza) — A β-galactosidase enzyme
  • Spanish: lactasa — A β-galactosidase enzyme
  • Swedish: laktas — A β-galactosidase enzyme
  • Turkish: laktaz — A β-galactosidase enzyme
  • Vietnamese: lactaza — A β-galactosidase enzyme