a biological mother (birth mother) or biological father (birth father); a biological parent.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for birth mother
the woman who gives birth to a child, regardless of whether she is the genetic mother or subsequently brings up the child
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
Medicine definitions for birth mother (1 of 2)
A biological mother.
Medicine definitions for birth mother (2 of 2)
A biological parent.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.