ADJ.
extensive
VERB + BOREHOLE
drilled
BOREHOLE + NOUN
backyard, information
PREP.
in
noun
A hole bored into the ground to collect samples for analysis or to extract oil or water.
Near-synonym: well
The state of the groundwater is monitored at various boreholes in the area.
Any other hole that has been bored into something.
There were little boreholes in the oak beam, indicating that insects had once taken some interest in it.
verb
To bore a hole of this kind (in).
Extensive borehole information and tendered contract prices make these cost estimates much more plausible than earlier estimates.
Daniel drilled a borehole in the backyard.