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birth parent

or birth·par·ent

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noun
  1. 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. 2018
birth father in Medicine

birth father

n.
  1. A biological father.

birth parent

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