Etymology

stepbrother

step·broth·er
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Today it means: The son of one's stepparent by a previous relationship. Full definition →

English brother ← Middle English brother ← Old English brōþor
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The story

  1. Proto-Indo-European*(s)tew-
  2. Proto-Germanic*steupa-
  3. Proto-West Germanic*steupa-
  4. Old Englishstēop-
  5. Middle Englishstep-
  6. Englishstep-
  7. Proto-Indo-European*bʰréh₂tēr
  8. Proto-Germanic*brōþēr
  9. Proto-West Germanic*brōþer
  10. Old Englishbrōþor
  11. Middle Englishbrother
  12. Englishbrother
  13. English todaystepbrother

From step- + brother.

Etymology from Wiktionary, CC BY-SA 4.0.