retardent

English Thesaurus

1. any agent that retards or delays or hinders (noun.object)

hypernym	:	agent,
definition	:	an active and efficient cause; capable of producing a certain effect (noun.object)

derivation	:	retard,
definition	:	cause to move more slowly or operate at a slower rate (verb.change)

derivation	:	retard,
definition	:	cause to move more slowly or operate at a slower rate (verb.change)