stepmother

noun6

1. •
   A woman who is a subsequent wife or partner of a person's parent, usually following the divorce or separation of their parents, or the death of one's biological mother.
2. •
   Synonym of co-mother (“the non-birth mother of a child in a lesbian couple”).
3. •
   A person or thing likened to a stereotypical stepmother, having cold, cruel, or ungenerous qualities.
4. •
   An animal, typically a bird, who raises the offspring of another animal.
5. •
   (rare) A viola, especially Viola tricolor, heartsease.

   • The second came up about ten days later in the lee of the channel marker, and it was called stepmother, or love-in-idelness. — 1974
6. •
   Clipping of stepmother's blessing.