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-mother is a noun meaning "a woman who is a foster parent and raises another's child". It carries one recorded sense.
a woman who is a foster parent and raises another's child
Definitions, synonyms and semantic relations for foster-mother come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.