(tennis) A machine that shoots tennis balls out of a pipe, allowing a player to practise hitting them.

(physics) Any combination of simple machines working together

An individual weapon for war, especially a mechanical one such as a siege engine or tank. / The military resources of a belligerent country considered as a whole.

plural of war machine

A screw designed for metal or a similar material, usually with no point and a relatively fine thread, intended for prepared, threaded holes.

(computing) A software emulation of a computer that runs in an isolated partition of a real computer.

(humorous) An imaginary device which removes the flavor from something, particularly food.

plural of rowing machine

An exercise machine whose action resembles that of rowing a boat.

Any of a great variety of devices, powered either by electricity or by the user, used to improve strength or physical fitness.