Here you will find one or more explanations in English for the word Constrictors.
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Constrictor
Constrictor Con*strict"or, 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. (Zo["o]l.) A serpent that kills its prey by inclosing and
crushing it with its folds; as, the boa constrictor.
Meaning of Constrictors from wikipedia