clapboard
(organic chemistry) A levorotatory acid with chemical formula C₇H₁₂Cl₂O₆, found in the urine of a person who has taken chloral hydrate.
plural of smartcard
(film) A clapper board; a device used in film production, having hinged boards that are brought together with a clap, used to synchronize picture and sound at the start of each take of a motion picture or other video production.
plural of duplicon
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