constrictor

Con*strict"or, n. 1. That which constricts, draws together, or contracts. 2. (Anat.) Defn: A muscle which contracts or closes an orifice, or which compresses an organ; a sphincter. 3. (Zoöl.) Defn: A serpent that kills its prey by inclosing and crushing it with its folds; as, the boa constrictor.

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