Word Study
stepmother
CIDE DICTIONARY
stepmother, n. [AS. steópmōder.].
The wife of one's father by a subsequent marriage. [1913 Webster]
OXFORD DICTIONARY
stepmother, n. a female step-parent.
Etymology
OE steopmodor (as STEP-, MOTHER)
THESAURUS
stepmother
dam, foster mother, genetrix, ma, mam, mama, mammy, mater, materfamilias, maternal ancestor, matriarch, mom, mommy, mother, mummy, stepbrother, stepchild, stepdaughter, stepfather, stepsister, stepson, the old womanFor further exploring for "stepmother" in Webster Dictionary Online