Etymology
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constrictor (n.)

"that which constricts," 1735, originally "a muscle which draws parts together," agent noun in Latin form from constrict. Meaning "a large serpent which envelops and crushes its prey in its coils" is from 1790.

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Definitions of constrictor

constrictor (n.)
any of various large nonvenomous snakes that kill their prey by crushing it in its coils;
From wordnet.princeton.edu