Definition of birth mother
: the mother of a child when the child is born
specifically
: a woman who gave birth to a child who has been adopted
They had turned to an open adoption after pursuing infertility treatments for 18 years, and the birth mother had agreed to relinquish custody at the hospital. — Emily Nussbaum
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“Birth mother.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/birth%20mother. Accessed 28 Jun. 2022.
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Time Traveler for birth mother
The first known use of birth mother was in 1906
See more words from the same year