A machine tool for cutting grooves, key seats, or slots; a slotting machine.

plural of splining machine

prayer wheel

plural of machine translation

(slang) A heavy vehicle used to transfer concrete lane dividers on a roadway.

plural of sex-machine

Alternative form of sex machine

An exercise machine consisting of two pedals on a frame. The user steps on each of the pedals in turn, moving the legs in a way similar to climbing.

plural of Tipler machine

Synonym of Tipler cylinder