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birth mother
birth moth·er (plural birth moth·ers) or birth·moth·er [ búrth mùər ] (plural birth·moth·ers)


noun 
Definition:
 
somebody's natural mother: a person's biological mother, especially in the case of an adopted child
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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