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retarder (n.)
1640s, "one who or that which checks or delays," agent noun from retard (v.). Scientific sense of "substance which slows down a reaction" by 1878. Specifically of braking mechanisms by 1937, originally on railroad cars.
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Dictionary entries near retarder
retard
retardance
retardant
retardation
retarded
retarder
retch
rete
reteach
retell
retention