Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: fostor-, from fostor 'food, feeding'

foster

2 adjective
     
foster2
1

foster mother/father/parents

the people who foster a child:
It is sometimes difficult to find suitable foster parents.
2

foster child/son/daughter

a child who is fostered
3

foster brother/sister

someone who has different parents from you, but who is being brought up in the same family
4

foster home

SSC a private home where a child is fostered

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