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American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Gynaecology & Obstetrics) another word for colostrum
2. (Agriculture) the first milk drawn from a cow's udder prior to milking
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a yellow fluid rich in protein and immune factors, secreted by the mammary glands during the first few days of lactation.
[1570–80; < Latin colostrum, colustrum beestings]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.