- tower rock
- Townsend conduction
- trace element
- trace intensity
- track rod
- torsion constant
- torsion joint
- total heat
- total production
- total reflux
- total sulphur
- tow tractor
- tower sludge
- town-dues
- trachyte
- trachytoid structure
- tracing cloth
- track haulage
- Track scale
- trackless
- tractor shovel
- trade
- topographic landmark
- topped
- topping tower
- tops
- torch hardening
- torrent
- total cyanide
- total depth
- total displacement
- total losses
- total recovery
- tour report
- tourmalinization
- tow boat
- town gas
- toxicity
- tracer
- trachydolerite
- trachytoid texture
- track hopper
- tractor loader
- trade refuse
- trailer caisson
- trailing axle
- trans effect
- transcendental function
- transcrystalline corrosion
- transcrystalline crack
- transfer assembly
- transfer case
- transfer molding
- transfer moulding
- transfer port
- transfer rate
- transfer table
- transfer unit
- transformation temperature
- transformer oil
- transformism
- transgressive overlap
- transient phase
- transition zone
- transmission grease
- transmission lubricant
- transmittancy
- transmutation theory
- transparent grease
- transpiration element
- trap indicator
- trap pressure
- trapezohedron
- traveling block
- transgression
- transient formation
- transition era
- transition metal
- transition order
- transition type
- translation temperature
- transmission lag
- transmission oil
- transmission system
- transportation map
- transshipment
- trap rock
- trapped piping
- travel time
- traveling grate
- travelling hoist
- tray tower
- treating
- treating agent
- treechmannite
- trench excavation
- trench shore
- trenching plant
- trenton limestone
- triamorph