Webster's English Dictionary

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retard

Cross references:
  1. delay                 
 
1. re.tard \ri-'ta:rd\ vb [L retardare, fr. re- + tardus slow] 1: to make 
   slow or slower : IMPEDE  2: to delay academic progress by failure to 
   promote  : to undergo retardation  - re.tard.er n
2. retard n : a holding back or slowing down : RETARDATION