slug

Any of many terrestrial pulmonate gastropod mollusks, having no (or only a rudimentary) shell.

(obsolete) A slow, lazy person; a sluggard.

A bullet or other projectile fired from a firearm; in modern usage, generally refers to a shotgun slug.

A solid block or piece of roughly shaped metal.

A counterfeit coin, especially one used to steal from vending machines.

A shot of a drink, usually alcoholic.

(journalism) A title, name or header, a catchline, a short phrase or title to indicate the content of a newspaper or magazine story for editing use.

(physics, rarely used) the Imperial (English) unit of mass that accelerates by 1 foot per second squared (1 ft/s²) when a force of one pound-force (lbf) is exerted on it.

A discrete mass of a material that moves as a unit, usually through another material.

A motile pseudoplasmodium formed by amoebae working together.

(rail transport) An accessory to a diesel-electric locomotive, used to increase adhesive weight and allow full power to be applied at a lower speed. It has trucks with traction motors, but lacks a prime mover, being powered by electricity from the mother locomotive, and may or may not have a control cab.

(television editing) A black screen.

(letterpress typography) A piece of type metal imprinted by a linotype machine; also a black mark placed in the margin to indicate an error; also said in application to typewriters; type slug.

(regional) A stranger picked up as a passenger to enable legal use of high occupancy vehicle lanes.

(US, slang, District of Columbia) A hitchhiking commuter.

(web design) The last part of a clean URL, the displayed resource name, similar to a filename.

(obsolete) A hindrance, an obstruction.

A ship that sails slowly.