In polygamy, a wife of one's father who is not one's mother; that is, co-wife of one's mother.
In polygamy, the relationship between one co-wife and another, in respect to their children.
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.
One's wife.
One's mother.
An elderly woman.
A person (irrespective of age or sex) who is always complaining about his or her situation.
The plant sea wormwood.