Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
foster-child is a noun meaning "a child who is raised by foster parents". It carries one recorded sense.
a child who is raised by foster parents
Definitions, synonyms and semantic relations for foster-child come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.