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

 

dandy

 adjective
adjective
BrE BrE//ˈdændi//
 
; NAmE NAmE//ˈdændi//
 
 
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(old-fashioned, especially North American English) very good Word Origin late 18th cent.: perhaps a shortened form of 17th-cent. Jack-a-dandy ‘conceited fellow’ (the last element representing Dandy, a pet form of the given name Andrew).
See the Oxford Advanced American Dictionary entry: dandy