- drive unit
- driver
- driver tube
- driving axle
- driving cap
- driving force
- driving gear
- driving helmet
- driving machine
- driving moment
- driving pulley
- driving report
- driving sprocket
- driving wheel
- drizzling rain
- drogue
- drone
- drooping dipole
- drop anchor
- drop counter
- drop hammer
- drop height
- drop shop
- drop stamping
- drop weight
- dropsonde
- dross
- drove
- drowned lime
- drowned weir
- drug
- drum plotter
- dry broke
- dry content
- dry crushing
- doub
- double
- double beads
- double buffering
- double cable
- double casing
- double cosset
- double crucible
- double density
- double diode
- double element
- double function
- double glazing
- double image
- double insulation
- double line
- double piston
- double point
- double precision
- double purpose
- double quotes
- double root
- double salt
- double sampling
- double space
- double superheterodyne
- double taction
- double tenon
- double thread
- double winding
- double word
- double-action
- double-coursed
- double-rivet
- double-sided
- double-threaded
- doublet
- doublet antenna
- doubling
- doubly
- doubt
- dough
- dovetail
- dovetail joint
- dovetail plane
- dovetailing machine
- dowel hole
- doweled
- doweled joint
- down
- down counter
- down draught
- down gust
- down key
- down milling
- down path
- down shaft
- down stream
- downcomer
- downflow
- downhill slope
- downhole
- downlink
- downloading
- downpipe