Definitions
1.NounThat which constricts or tightens:
A muscle whose contraction narrows a vessel or passage or compresses an organ.
2.NounA muscle whose contraction narrows a vessel or passage or compresses an organ.
3.NounEllipsis of pharyngeal constrictor (“each of the muscles which constrict the pharynx”).
4.NounEllipsis of boa constrictor, either the species Boa constrictor or a similar snake that kills by constriction.