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retardant (adj.)
[retardant 词源字典]
1640s, from
retard
(v.) +
-ant
or from Latin
retardantem
(nominative
retardans
), present participle of
retardare
. From 1952 as a noun, "retardant substance."
[retardant etymology, retardant origin, 英语词源]
[retardant 词源字典]