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

BrE BrE//ˈriːtɑːd//
; NAmE NAmE//ˈriːtɑːrd//
(taboo, slang) an offensive way of describing somebody who is not intelligent or who has not developed normally
Word Origin late 15th cent.: from French retarder, from Latin retardare, from re- ‘back’ + tardus ‘slow’.

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