preventer noun. [prɪ'vɛntǝ] L16.
[formed as PREVENTATIVE + -ER¹.]
1. A person who or thing which hinders, restrains, or stops something from happening or being done. L16.

2. Nautical. A rope, chain, etc., used to provide temporary additional support to rigging in high winds or storms. Also more fully preventer-rope. E17.

3. In full blow-out preventer. A heavy valve or assembly of valves fitted above an oil or gas well during drilling and closed in the event of a blow-out. E20.

[TahlilGaran] English Dictionary ▲