- Drain
- Drainage
- Drainage basin
- Drainage density
- Drainage divide
- Drainage gradient
- Drainage system
- Drainage tile
- Drainage tunnel
- Draize test
- Draw
- Drawbar pull
- Drawdown
- Drawer
- Drawing
- Drawing tower
- Drayage
- Drazin inverse
- Dredging
- Drift
- Drift current
- Drift ice
- Drift velocity
- Drift waves
- Drill
- Drill bit
- Drill collar
- Drill cuttings
- Drill pipe
- Drill string
- Drilling
- Drilling and blasting
- Drilling engineering
- Drilling fluid
- Drilling fluid invasion
- Drilling rigs
- Drilling riser
- Drinking
- Drinking fountains
- Drinking water
- Drinking water quality standards
- Drive by wire
- Drive shaft
- Drive wheels
- Drive-by download
- Driven element
- Driven right leg circuit
- Driver drowsiness detection
- Driver monitoring system
- Driver scheduling problem
- Drivetrain
- Driving cycle
- Driving licence
- Driving simulators
- Drooling
- Drools
- Drop impact
- Drop point
- Drop size distribution
- Drop structure
- Drop test
- Drop tower
- Drop tube
- Droplet nuclei
- Droplet-based microfluidics
- Droplets
- Dropping funnel
- Dropping point
- Drops
- Dropstones
- Dropwise condensation
- Dross
- Drought
- Drucker stability
- Drude model
- Drug allergy
- Drug carriers
- Drug delivery
- Drug delivery to the brain
- Drug design
- Drug development
- Drug discovery
- Drug injection
- Drug metabolism
- Drug overdose
- Drug packaging
- Drug permeability
- Drug repositioning
- Drug repurposing
- Drug resistance
- Drug-eluting stent
- DrugBank
- Drugs
- Drum
- Drum brakes
- Drum drying
- Drumlins
- Drupal
- Drusen
- Druses
- Dry cask storage
- Dry cell
- Dry cleaning
- Dry dam
- Dry distillation
- Dry dock
- Dry etching
- Dry eye
- Dry eye syndrome
- Dry gas
- Dry gas seal
- Dry lake
- Dry lubricants
- Dry matter
- Dry mouth
- Dry plate
- Dry ports
- Dry powder inhaler
- Dry reforming
- Dry skin
- Dry stone
- Dry water
- Dry weight
- Dry well
- Dry-ice blasting
- Dry-powder inhaler
- Drying
- Drying oil
- Drying tube
- Dryland salinity
- Dryness
- Drywall
- Dual
- Dual basis
- Dual graph
- Dual lattice
- Dual linear program
- Dual loop
- Dual modular redundancy
- Dual module
- Dual numbers
- Dual pair
- Dual phase steel
- Dual polyhedron
- Dual problem
- Dual quaternions
- Dual space
- Dual system
- Dual-clutch transmission
- Dual-energy x-ray absorptiometry