Definition of foundling noun from the Oxford Advanced Learner's Dictionary

 

foundling

 noun
noun
BrE BrE//ˈfaʊndlɪŋ//
 
; NAmE NAmE//ˈfaʊndlɪŋ//
 
(old-fashioned)
 
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a baby who has been left by its parents and who is found and taken care of by somebody else Word Origin Middle English: from found (past participle of find) + -ling, perhaps on the pattern of Dutch vondeling.
See the Oxford Advanced American Dictionary entry: foundling