Co-mother Definition
    noun
  
 In polygamy, a wife of one's father who is not one's mother; that is, co-wife of one's mother.
Wiktionary 
In polygamy, the relationship between one co-wife and another, in respect to their children.
 Wiktionary 
In a lesbian couple, the nonbirth mother (partner of the birth mother) of a child, especially one who takes an equal role in mothering the child.
 Wiktionary 
Other Word Forms of Co-mother
Noun
Singular:
 co-motherPlural:
 co-mothersOrigin of Co-mother
-  com- + mother, as calque of Latin commater, French commère From Wiktionary 
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