The wife of one's biological father, other than one's biological mother. / (botany, rare) A viola, especially Viola tricolor, heartsease.

plural of stepmother

A previous wife of one's father during one's lifetime, other than one's mother, typically following the divorce or death of the mother.

plural of ex-stepmother

The state of being a stepmother.

Like or befitting a stepmother

The quality of being stepmotherly.

Without a stepmother.