allomaternal
adjective
al·lo·ma·ter·nal
ˌa-lō-mə-ˈtər-nəl
: of, relating to, or provided by an allomother
… there is a correlation between allomaternal care and enhanced maternal reproductive success.—Sarah Blaffer Hrdy, in Neurobiology of the Parental Brain, 2008
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Merriam-Webster unabridged
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