preventer

Is the HPV vaccine a life-saving cancer preventer…or a potentially deadly dose for girls?

The blowout preventer sits near the seabed and is the crew's last line of defense against what happened on April 20.

The next thing to be done was to secure the tents with preventer-stays, as the seamen called them.

Preventer stays: Additional ropes set up taut to prevent spars carrying away when a vessel is under a press of canvas.

Preventer—A rope used to prevent the straining or breaking of a spar or sail.

They would then have rigged preventer-stays and shrouds on their shaky spars, had there been time; but there was not.

They even put preventer stays on the masts and on the boilers to keep them from rolling out of the crazy old wagon.