Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A son of one's stepparent.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The son of one's stepfather or stepmother who is not the son of one's mother and is not the son of one's father.
  • n. The stepson of one's father or mother which is not one's half-brother.

from the GNU version of the Collaborative International Dictionary of English

  • n. A brother by the marriage of one's father with the mother of another, or of one's mother with the father of another.

from The Century Dictionary and Cyclopedia

  • n. One's stepfather's or stepmother's son by a former marriage.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a brother who has only one parent in common with you

Etymologies

step- +‎ brother (Wiktionary)

Examples

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