a biological mother (birth mother) or biological father (birth father); a biological parent.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Medicine definitions for birth father (1 of 2)
A biological father.
Medicine definitions for birth father (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.