(dated) spark plug

A single-wire male component of a banana connector.

plural of banana plug

plural of butt plug

a bed of cells that form the normal corneal epithelium.

(transitive) To put a plug or bung into something; to interrupt the flow of. / (transitive) To reinforce something weak.

Alternative form of drainplug

plural of plug hat

A screw-cutting tap with a slightly tapering end.

A rod attached to the beam for working the valves, as in the Cornish engine.