retarder

noun

re·​tard·​er

rə̇ˈtärdər, 

rēˈ-, 

-tȧdə(r

plural -s

: one that retards: such as

a

: a substance that when added to a cement or to gypsum plaster prolongs the setting time

b

: restrainer

c

: a power-operated braking device placed in the classification tracks of hump yards to control the speed of moving railroad cars

d

: a substance added in small proportion to a rubber compound for retarding vulcanization

Word History

Etymology

retard entry 1 + -er

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Rhymes for retarder

• ardor
• carder
• harder
• larder