getter

noun

1. a person or thing that gets.
2. any substance introduced into a partial vacuum, as the interior of a vacuum tube or an incandescent lamp, to combine chemically with the residual gas in order to increase the vacuum.
3. Chiefly Canadian. poisoned bait used to exterminate wolves, gophers, and other pests from farm areas.

noun

1. a person or thing that gets
2. a substance, usually a metal such as titanium, evaporated onto the walls of a vacuum tube, vessel, etc, to adsorb the residual gas and lower the pressure

verb

3. (tr) to remove (a gas) by the action of a getter