borehole

noun

1. 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.”

   “Extensive borehole information and tendered contract prices make these cost estimates much more plausible than earlier estimates.”

2. 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

1. (ambitransitive)To bore a hole of this kind (in).