stepsister

[ step-sis-ter ]
/ ˈstɛpˌsɪs tər /

noun

one's stepfather's or stepmother's daughter by a previous marriage.

Origin of stepsister

late Middle English word dating back to 1400–50; see origin at step-, sister
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for stepsister

stepsister
/ (ˈstɛpˌsɪstə) /

noun

a daughter of one's stepmother or stepfather by a union with someone other than one's father or mother respectively
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012