Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A stepbrother or a stepsister.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The child of one's stepfather or stepmother from another relationship; a stepbrother or stepsister

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

step- +‎ sibling

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