One of the mysteries of the English language finally explained.
That reduces; (Chemistry) = "reducing".
A thing that reduces or brings about reduction; (Chemistry) = "reductant".
Late 17th century (in an earlier sense). From post-classical Latin reducent-, reducens (of a vessel) carrying blood back to the heart, (in chemistry) that reduces, use as adjective of classical Latin redūcent-, redūcēns, present participle of redūcere reduce.
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