v. & n.
v.tr. 1 make slow or late. 2 delay the progress, development, arrival, or accomplishment of.
n. retardation. in retard delayed, in the rear. retardant adj. & n. retardation n. retardative adj. retardatory adj. retarder n. retardment n.
[ F retarder f. L retardare (as RE-, tardus slow) ]