A person who denies or refuses to acknowledge something; also, a unit of weight for thread or yarn fibers.
From French 'denier' (one who denies) from 'denier' (to deny), also historically a small French coin. The textile meaning derives from the weight of silk threads measured in deniers.
A 'denier' in hosiery means a thread so fine that 9,000 meters of it weighs exactly one gram—it's an absurdly precise measurement named after an old French coin, showing how commerce shapes scientific units.
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