CONSTRICTOR

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