1. Abbreviation or symbol for large calorie; carbon; cathodal; cathode; cervical vertebra (C1–C7); closure (of an electrical circuit); congius (gallon); contraction; coulomb; curie; cylinder; cylindric lens; cytidine; cysteine; cytosine; component of complement (C1–C9); third substrate in a multisubstrate enzyme-catalyzed reaction.
2. When followed by subscript letters, Cin, indicates renal clearance of a substance (inulin). When followed by subscript numbers, C19, indicates the number of carbon atoms in a molecule, 19.
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