motor that converts thermal energy to mechanical work | engine that converts mechanical energy into electrical energy by electromagnetic induction |
a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks | an apparatus that produces a vapor or gas |
an instrument or machine that is used in warfare, such as a battering ram, catapult, artillery piece, etc. | an electronic device for producing a signal voltage |
something used to achieve a purpose | someone who originates or causes or initiates something |