plural of engine-generator

plural of engineering strain

An engineer who works at an oilfield

plural of switch engine

A switcher or shunter: a railroad locomotive used for shunting.

plural of dental engine

A mechanical appliance giving a rotary motion to a dentist's boring instruments.

plural of pony engine

A small engine used for shunting wagons, etc.

(historical) A machine in which the energy of an electric current is used, by means of two small electromagnets, to keep up the vibrations of a large and heavily-weighted tuning fork whose arms are connected to two pistons working a miniature pump.