(dril) noun
1. A boring tool for metal or other hard substance.
2. The art or action of training in military exercises; hence, thorough and regular discipline in any branch of knowledge, activity, or industry. See synonyms under PRACTICE.
3. Zool. A mollusk (Urosalpinx cinereus) which kills oysters by drilling holes in their shells.
—v.t.
1. To pierce or bore with or as with a drill.
2. To bore (a hole).
3. To train in military exercises.
4. To instruct by methodical exercises.
5. To impart by methodical exercises: He drilled the lessons into his students.
—v.i.
6. To use a drill.
7. To engage in military exercises.
8. To engage in methodical exercises. See synonyms under PIERCE, TEACH. [<Du. dril, drille <drillen bore]
DRILLS
a. V–drill (metal).
b. Twist drill (metal).
c. Center bit (wood).
d. Countersink (wood or metal).
e. Twist bit (wood).
ƒ. Earth borer.

(dril) Agric. noun
1. A machine for planting seeds in rows.
2. A small furrow in which seeds are sown.
3. A row of seeds so planted.
—v.t. To plant in rows: to drill a field; to drill seeds.
—v.i. To sow or plant in drills. [Origin uncertain]

(dril) noun
Heavy, twilled linen or cotton cloth. Also drill′ing. [Short for drilling <G drilich cloth with three threads <L trilix <tres three + licium thread]

(dril) noun
A black–faced baboon of West Africa (genus Papio), similar to the mandrill. For illustration see MANDRILL. [? <native name]