The Collaborative International Dictionary
Drill \Drill\, n.
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.
(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.
Any exercise, physical or mental, enforced with regularity and by constant repetition; as, a severe drill in Latin grammar.
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(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.
Wikipedia
Urosalpinx cinerea, common name the eastern or Atlantic oyster drill, is a species of small predatory sea snail, a marine gastropod mollusk in the family Muricidae, the murexes or rock snails.
They use chemoreception in their environment and are found to be sessile and encrusting organisms. Microscopic particles released by prey are carried through the sea water and captured by the Atlantic Oyster Drill. This animal is not physically able to close itself from its surrounding environment because of its siphonal canal.
This species is a serious problem in commercial oyster beds, and it has been accidentally introduced well outside its natural range.