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[kuh-los-truh m] /kəˈlɒs trəm/
a yellowish liquid, especially rich in immune factors, secreted by the mammary gland of female mammals a few days before and after the birth of their young.
Also called foremilk.
Origin of colostrum
1570-80; < Latin colostrum, colustrum beestings
Related forms
colostral, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for colostrum


the thin milky secretion from the nipples that precedes and follows true lactation. It consists largely of serum and white blood cells
Derived Forms
colostral, adjective
Word Origin
C16: from Latin, of obscure origin
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
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Word Origin and History for colostrum

1570s, from Latin colostrum "first milk from an animal," of unknown origin.

Online Etymology Dictionary, © 2010 Douglas Harper
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colostrum in Medicine

colostrum co·los·trum (kə-lŏs'trəm)
The first milk secreted at the time of parturition, differing from the milk secreted later by containing more lactalbumin and lactoprotein, and also being rich in antibodies that confer passive immunity to the newborn. Also called foremilk.

co·los'tral (-trəl) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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