Share this entry
lactase Line breaks: lac|tase
Pronunciation: /ˈlakteɪz/

Definition of lactase in English:


[mass noun] Biochemistry
An enzyme which catalyses the hydrolysis of lactose to glucose and galactose.
Example sentences
  • The enzyme lactase breaks down the lactose to galactose and glucose.
  • Many people take extra doses of naturally produced enzymes, such as lactase, pepsin and trypsin, in supplement form.
  • Lactose, the sugar present in milk, is split in the small intestine by the enzyme lactase into its constituent glucose and galactose molecules, allowing absorption of the glucose.


Late 19th century: from lactose + -ase.

Definition of lactase in:
Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Subscribe to remove adverts and access premium resources