Source : Webster's Revised Unabridged Dictionary (1913)
Drill \Drill\, n.
1. An instrument with an edged or pointed end used for making
holes in hard substances; strictly, a tool that cuts with
its end, by revolving, as in drilling metals, or by a
succession of blows, as in drilling stone; also, a drill
press.
2. (Mil.) The act or exercise of training soldiers in the
military art, as in the manual of arms, in the execution
of evolutions, and the like; hence, diligent and strict
instruction and exercise in the rudiments and methods of
any business; a kind or method of military exercises; as,
infantry drill; battalion drill; artillery drill.
3. Any exercise, physical or mental, enforced with regularity
and by constant repetition; as, a severe drill in Latin
grammar.
4. (Zo["o]l.) A marine gastropod, of several species, which
kills oysters and other bivalves by drilling holes through
the shell. The most destructive kind is {Urosalpinx
cinerea}.
{Bow drill}, {Breast drill}. See under {Bow}, {Breast}.
{Cotter drill}, or {Traverse drill}, a machine tool for
drilling slots.
{Diamond drill}. See under {Diamond}.
{Drill jig}. See under {Jig}.
{Drill pin}, the pin in a lock which enters the hollow stem
of the key.
{Drill sergeant} (Mil.), a noncommissioned officer whose
office it is to instruct soldiers as to their duties, and
to train them to military exercises and evolutions.
{Vertical drill}, a drill press.