#1 retard v. cause to move more slowly or operate at a slower rate; "This drug will retard your heart rate". wn
#2 retard n. [idiot, imbecile, cretin, moron, changeling, half-wit] a person of subnormal intelligence. wn
#3 retard v. be delayed. wn
#4 retard v. [check, delay] slow the growth or development of; "The brain damage will retard the child's language development". wn
#5 retard v. [decelerate, slow, slow down, slow up] lose velocity; move more slowly; "The car decelerated". wn
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