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borehole

   Also found in: Acronyms, Wikipedia 0.04 sec.
bore·hole  (bôrhl, br-)
n.
A hole that is drilled into the earth, as in exploratory well drilling or in building construction.


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Phase two of the deep drilling program involves deepening three boreholes drilled during phase one in April 2006 and extending them into the known mineralized zone at the 701-m to 762-m level.
China buys Redstone ore by Larmour, Adelle / Northern Ontario Business
The scientists now report that at a depth of 766 m, a borehole pierced a beach ball-size rock that boars the chemical signature of an extraterrestrial object.
Blast survivors: fragments of asteroid found in ancient crater by Perkins, S. / Science News
This summer, scientists began using the borehole to pull up samples of rock from within the fault (see diagram, left).
Digging deep: scientists drill into the planet to catch earthquakes ... by Gaidos, Susan / Science World
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