Stepsister (noun)

1. A daughter of one's stepmother or stepfather.
2. A daughter of one"s stepmother or stepfather, as related to one"s parent by marriage.

Origin:

From "step" meaning a level surface on which to place one"s foot and "sister" meaning a female sibling.

Examples:

1. She didn't get along well with her stepsisters.
2. Cinderella had two stepsisters who treated her poorly.
3. The stepsisters were jealous of Cinderella's beauty.
4. The stepsisters were cruel to Cinderella.
5. The stepsisters were not related to Cinderella by blood.