Usually means: Sibling through foster care arrangement.
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We found 12 dictionaries that define the word foster brother:

General (12 matching dictionaries)
  1. foster brother: Merriam-Webster
  2. foster-brother, foster brother: Vocabulary.com
  3. foster-brother, foster brother: Wordnik
  4. foster brother: Infoplease Dictionary
  5. Foster brother, foster-brother, foster brother: Dictionary.com
  6. Foster brother: Wikipedia, the Free Encyclopedia
  7. foster-brother: Rhymezone
  8. foster-brother: Webster's 1828 Dictionary
  9. foster-brother, foster brother: FreeDictionary.org
  10. foster-brother, foster brother: Mnemonic Dictionary
  11. foster-brother, foster brother: TheFreeDictionary.com
  12. foster brother: Wiktionary

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Definitions from Wiktionary (foster brother)

▸ noun:  A male foster sibling.

Similar:
foster father, foster child, foster parent, half brother, stepbrother, Brothers, foster care, foster home, fosterage, little brother, more...

▸ Words similar to foster brother

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▸ Words that often appear near foster brother

▸ Rhymes of foster brother

▸ Invented words related to foster brother

Similar:
foster father, foster child, foster parent, half brother, stepbrother, Brothers, foster care, foster home, fosterage, little brother, more...



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