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al·lo·moth·er | \ ˈa-lə-ˌmə-t͟hər 
\
\ plural allomothers
Definition of allomother
: an individual other than the biological mother of an offspring that performs the functions of a mother (as by caring for an infant temporarily)
The allomother suckled the second infant for two and one-half minutes before it was retrieved by its own mother.— Sarah Blaffer Hrdy, The Langurs of Abu: Female and Male Strategies of Reproduction, 1980 … by five months of age, babies spend more time with allomothers than with their own mother …— Claudia R. Valeggia, in Substitute Parents: Biological and Social Perspectives on Alloparenting, 2009
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The first known use of allomother was in 1980
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