preventer

Meaning

1. One who, or that which, prevents.
2. An arrangement, made with ropes and blocks, that prevents the boom of a sailing boat from performing a jibe.
3. Any of various lines set up to reinforce or relieve ordinary running or standing rigging.

Synonyms

balker

precautionary measures

preventive measure

protective device

protective equipment

safeguard

warning device

preventive measures

protection device

trammeler

cumberer

prophylactic measures

Etymology

From prevent + -er.