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Meaning of preventer

pre•vent•er

Pronunciation: (pri-ven'tur), [key]
— n.
  1. a person or thing that prevents.
    1. any of various lines set up to reinforce or relieve ordinary running or standing rigging.
    2. a line for preventing a sail from jibbing.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.