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birth parent

noun
1.
a biological mother (birth mother) or biological father (birth father) a biological parent.
Also, birthparent.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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birth-mother in Medicine

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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