district air crossing - drill hole collar
- downhole pressure gauge
- downhole sensor
- downhole surveys
- downhole treatment
- downlap
- downleap
- downplunge projection
- downpour
- downpunching
- downs
- downsand
- downside
- downslip fault
- downslope
- downstoping
- downstopping
- downstream
- downstream face of dam
- downstream side
- downstream side of dune
- downstream toe
- downstream well
- downsweep
- downsweep signal
- downsweeping
- downthrow
- downthrow fault
- downthrow side
- downthrown
- downthrown block
- Downtonian
- downward
- downward continuation
- downward current
- downward digging
- downward enrichment
- downward gradient
- downward pressure
- downward raypath
- downward traveling wave