foster mother

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noun

a woman who takes the place of a mother in raising a child.
a nurse.

Origin of foster mother

before 1000; Middle English; Old English
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for foster mother

foster mother

noun

a woman who looks after or brings up a child or children as a mother, in place of the natural or adoptive mother

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012