What is the meaning of Constrictor?

That which constricts or tightens:

  1. A muscle whose contraction narrows a vessel or passage or compresses an organ.

    A muscle whose contraction narrows a vessel or passage or compresses an organ.

    Ellipsis of pharyngeal constrictor (each of the muscles which constrict the pharynx).

    Ellipsis of boa constrictor, either the species Boa constrictor or a similar snake that kills by constriction.

    That which constricts; constrictor.

    constrictor

    constricting

    Source: wiktionary.org