stepsibling

noun

stepsibling

noun

Etymology From step- + sibling.

1

The child of one's stepparent by a previous relationship.

With multiple stepparents, stepsiblings, half siblings and pseudosiblings, it’s a whole new type of family[…].2007 April 19, Kate Murphy, “Stepfamilies Try to Stretch Their Space”, in New York Times:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.