drill (redirected from drills down)

drill,

n a cutting instrument for boring holes by rotary motion.

drill, bibevel

(bībev´l),
n a drill with two flattened sides and the end cut in two beveled planes.

drill, spear-point,

n a drill with a tri-beveled, or threeplaned, point.

drill, trephine

(trifīn´),
n a surgical drill with a hollow cutting head used to remove a circular section of bone or other tissue; also used to remove failed dental implants.

drill, twist,

n a drill with one or more deep spiral grooves that extend from the point to the smooth part of the shaft.

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drill

1. one of the Old World monkeys; resembles the mandrill but has a black face. Called also Mandrillus leucophaeus.

2. in dentistry, a mechanical device used for removing tooth structure. See also bur.