English

Definition of foster adjective from the Oxford Advanced Learner's Dictionary

 

foster

 adjective
adjective
BrE BrE//ˈfɒstə(r)//
 
; NAmE NAmE//ˈfɔːstər//
 
, NAmE//ˈfɑːstər//
 
 
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[only before noun] used with some nouns in connection with the fostering of a child a foster mother/father/family foster parents a foster child a foster home foster care Word Origin Old English fōstrian ‘feed, nourish’, from fōster ‘food, nourishment’, of Germanic origin; related to food. The sense ‘bring up another's (originally also one's own) child’ dates from Middle English.
See the Oxford Advanced American Dictionary entry: foster