variants: or lacti- or lacto-

Definition of lact-

1 : milk lactoglobulin
2a : lactic acid lactate
b : lactose lactase

History and Etymology for lact-

French & Latin; French, from Latin, from lact-, lac — more at galaxy

Keep scrolling for more

Comments on lact-

What made you want to look up lact-? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

an enemy or opponent

Get Word of the Day daily email!

Test Your Vocabulary

Name That Thing: Animal Edition

  • alt 5a023732e6f75
  • Name that animal:
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!