Definition of slug
1
: sluggard
2
: a lump, disk, or cylinder of material (such as plastic or metal): such as
a (1)
: a musket ball
(2)
: bullet
b
: a piece of metal roughly shaped for subsequent processing
c
: a $50 gold piece
d
: 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
5 a
: a quantity of liquor drunk in one swallow
b
: a detached mass of fluid (such as water vapor or oil) that causes impact (as in a circulating system)
6 a
: a strip of metal thicker than a printer's lead
b
: a line of type cast as one piece
c
: 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
