constrictor

(-striktər)

noun

something that constricts; specif.,
  1. a muscle that contracts a cavity or opening, or compresses an organ
  2. a snake that kills by coiling around its prey and squeezing, thereby making breathing impossible

Origin: ModL

See constrictor in American Heritage Dictionary 4

noun
  1. One that constricts, as a muscle that contracts or compresses a part or organ of the body.
  2. Any of various snakes, such as the python or boa, that tightly coil around and asphyxiate their prey.

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