adj ·Rare ·Advanced level

Definitions

Adjective

1. 1
   Describing a method of drilling for petroleum in which the pressure in the wellbore is kept lower than that of the formation being drilled, thus allowing fluid to enter the well as soon as it is found. not-comparable

Etymology

From under- + balanced.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.