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retardant (adj.)

"tending to hinder," 1640s, from retard (v.) + -ant or from Latin retardantem (nominative retardans), present participle of retardare. From 1867 as a noun, "retardant substance, substance that inhibits some phenomenon or process."

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Definitions of retardant from WordNet

retardant (n.)
any agent that retards or delays or hinders;
flame-retardant
Synonyms: retardent / retardation
From wordnet.princeton.edu