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-mother
Plural:
co-mothers

Origin of Co-mother

  • com- +‎ mother, as calque of Latin commater, French commère

    From Wiktionary

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