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natural child

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noun
  1. Law.
    1. an illegitimate child; one born of illicit intercourse.
    2. (especially in Louisiana) an illegitimate child who has been lawfully acknowledged by its father.
  2. biological child.

Origin of natural child

First recorded in 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018