birth mother

birth parent

noun
a biological mother (birth mother) or biological father (birth father) a biological parent.
Also, birthparent.
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Collins
World English Dictionary
birth mother
 
n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

birth mother or birthmother
n.
A biological mother.

birth parent or birthparent
n.
A biological parent.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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