[ proh-lak-tin ]

  1. an anterior pituitary polypeptide hormone that stimulates lactation by the mammary glands at parturition in mammals, the activity of the crop in birds, and in some mammalian species the production of progesterone by the corpus luteum.

Origin of prolactin

First recorded in 1930–35; pro-1 + lact- + -in2
  • Also called lu·te·o·tro·pin [loo-tee-uh-troh-pin], /ˌlu ti əˈtroʊ pɪn/, ga·lac·tin [guh-lak-tin], /gəˈlæk tɪn/, an·te·ri·or pi·tu·i·tar·y lu·te·o·tro·pin, lac·to·gen·ic hor·mone .

Words Nearby prolactin Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use prolactin in a sentence

British Dictionary definitions for prolactin


/ (prəʊˈlæktɪn) /

  1. a gonadotrophic hormone secreted by the anterior lobe of the pituitary gland. In mammals it stimulates the secretion of progesterone by the corpus luteum and initiates and maintains lactation: Also called: luteotrophin, luteotrophic hormone See also follicle-stimulating hormone, luteinizing hormone

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for prolactin


[ prō-lăktĭn ]

  1. A protein hormone secreted by the anterior portion of the pituitary gland that stimulates and maintains the secretion of milk in mammals.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.