ETYM Icel. bâra wave: cf. German empor upwards, Old High Germ. bor height, burren to lift, perh. allied to AS. beran, Eng. bear.
(Homonym: boar, Boer, boor).
1. Diameter of a tube or gun barrel; SYN. caliber, calibre.
2. A person who evokes boredom; SYN. dullard.
3. (Mining terms) A hole or passage made by a drill; usually made for exploratory purposes; SYN. bore-hole, drill hole. + prikaži više

1. A rotating drill powered by an electric motor; SYN. electric drill.
2. A tool with a sharp point and cutting edges for making holes in hard materials (usually rotating rapidly or by repeated blows).
3. Similar to the mandrill but smaller and less brightly colored; SYN. Mandrillus leucophaeus.

ETYM German drillich, from Latin trilix having three threads, from the of tres three + licium a thread of the warm. Related to Three, Twill.
The act of drilling; SYN. boring.
Common woodworking and metal machinery process that involves boring holes with a drill bit. The commonest kind of drill bit is the fluted drill, which has spiral grooves around it to allow the cut material to escape. In the oil industry, rotary drilling is used to bore oil wells. The drill bit usually consists of a number of toothed cutting wheels, which grind their way through the rock as the drill pipe is turned, and mud is pumped through the pipe to lubricate the bit and flush the ground-up rock to the surface.
In rotary drilling, a drill bit is fixed to the end of a length of drill pipe and rotated by a turning mechanism, the rotary table. More lengths of pipe are added as the hole deepens. The long drill pipes are handled by lifting gear in a steel tower or derrick. + prikaži više

ETYM Old Eng. hol, hole, AS. hol, hole, cavern, from hol, hollow.
(Homonym: whole).
1. A depression hollowed out of solid matter; SYN. hollow.
2. A fault.
3. An opening deliberately made in or through something.
4. An opening into or through something.
5. An unoccupied space.
6. One unit of play from tee to green on a golf course. + prikaži više