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English definition of “retardant”

retardant

noun [C or U], adjective uk   /rɪˈtɑː.dənt/ us    /-ˈtɑːr-/
(a substance) that makes the progress or growth of something slower: Pot plants are commonly treated with (a) growth retardant so that they retain their shape. fire/flame retardant furniture (= furniture that does not burn easily)
(Definition of retardant from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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