Definition of "birthfather" [birthfather]

• The biological father of an adopted child (noun)

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• "The minor children in 1961 I know my birthmother and myself were in that catagory and I think the age of majority was probably 21 so maybe even my birthfather was a minor had a decision made that impacted all lives."
• "As long as her birthmother or birthfather haven't chosen to remain anonymous, Gay Ellen may finally be able to contact her family of origin, and learn about her family's medical history."
• "By August, we were matched with a nearby birthmother and birthfather who chose us to be the parents of their unborn child."