Webster’s Revised Unabridged Dictionary · 1913
Constrictor
Con·strict′or (kŏn·strĭk′tẽr), n. 1. That which constricts, draws together, or contracts.
2. (Anat.) A muscle which contracts or closes an orifice, or which compresses an organ; a sphincter.
3. (Zoöl.) A serpent that kills its prey by inclosing and crushing it with its folds; as, the boa constrictor.