slug

1 :  sluggard

2 :  a lump, disk, or cylinder of material (such as plastic or metal): such asa (1) :  a musket ball (2) :  bulletb :  a piece of metal roughly shaped for subsequent processingc :  a $50 gold pieced :  a disk for insertion in a slot machine; especially :  one used illegally instead of a coin

3 :  any of numerous chiefly terrestrial pulmonate gastropods (order Stylommatophora) that are found in most parts of the world where there is a reasonable supply of moisture and are closely related to the land snails but are long and wormlike and have only a rudimentary shell often buried in the mantle or entirely absent

4 :  a smooth soft larva of a sawfly or moth that creeps like a mollusk

5a :  a quantity of liquor drunk in one swallowb :  a detached mass of fluid (such as water vapor or oil) that causes impact (as in a circulating system)

6a :  a strip of metal thicker than a printer's leadb :  a line of type cast as one piecec :  a usually temporary type line serving to instruct or identify

7 :  the gravitational unit of mass in the foot-pound-second system to which a pound force can impart an acceleration of one foot per second per second and which is equal to the mass of an object weighing 32 pounds