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birth family

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noun
  1. one's biological parents and siblings, as contrasted with one's adoptive family.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

birth family in Medicine

birth family

n.
  1. A family consisting of one's biological as opposed to adoptive parents and their offspring.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.