Usually means: Shares one biological parent only.
Definitions Related words Mentions
We found 23 dictionaries that define the word half brother:

General (22 matching dictionaries)
  1. half brother: Merriam-Webster
  2. half-brother, half brother: Oxford Learner's Dictionaries
  3. half brother: American Heritage Dictionary of the English Language
  4. half-brother, half-brother: Collins English Dictionary
  5. half-brother, half brother: Vocabulary.com
  6. Half-Brother, Half-brother, half-brother: Wordnik
  7. half-brother: Cambridge Advanced Learner's Dictionary
  8. half-brother, half brother: Wiktionary
  9. half brother: The Wordsmyth English Dictionary-Thesaurus
  10. half brother: Infoplease Dictionary
  11. Half-brother, half-brother, half brother: Dictionary.com
  12. Half Brother (band), Half-brother, The Half Brother: Wikipedia, the Free Encyclopedia
  13. Half-brother: Online Plain Text English Dictionary
  14. half-brother: Webster's Revised Unabridged, 1913 Edition
  15. half-brother: Rhymezone
  16. Half-brother: AllWords.com Multi-Lingual Dictionary
  17. half-brother, half brother: FreeDictionary.org
  18. half-brother, half brother: Mnemonic Dictionary
  19. half-brother, half brother: TheFreeDictionary.com
  20. half brother: Longman Dictionary of Contemporary English

Medicine (1 matching dictionary)
  1. half-brother, half brother: Medical dictionary

Definitions from Wiktionary (half brother)

noun:  A male sibling sharing a single parent, as distinguished from a full brother or brother-german, from a step-brother, or from a brother-like figure such as a blood brother.

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