- triangular arrangement
- triangulation station
- tributary area
- trickle
- trickling
- trickling tower
- triclinic
- tricone rock
- trier
- trifilar gravimeter
- trigger
- trimethylbutane
- trinidad pitch
- trinitroresorcinol
- trigonal system
- trihydric acid
- trimellitic
- trimerize
- trimesic
- trimethylbenzene
- trimethylcarbinol
- trimolecular
- trimorphism
- trinitrated
- trinitrotoluene
- trip charter
- trip gas
- trip hammer
- tripartite
- triple board
- triple junction
- tripping
- triptane
- triturate
- trituration
- trondjemite
- trough grease
- trough line
- trough valley
- trough vein
- truck capacity
- true dip
- true solvent
- true stress
- truncated cylinder
- truncated upland
- truncation
- transfuse
- transient creeps
- transition form
- transition structure
- transmission brake
- transuranic elements
- transverse coast
- transverse valley
- trappoid breccia
- trass
- traveling mixer
- travelling
- travelling block
- tray spacing
- treater
- trebol
- trembling sieve
- trunk-buoy
- try
- tube
- tube cleaner
- tube sheet
- tube steel
- tube strip
- tube wrench
- tubing anchor
- tubing bleed
- tubing centralizer
- tubing elevator
- tubing head
- tubing stop
- tubular condenser
- tubular shaft
- tufaceous
- tug
- tug rim
- tumbling
- tungstate
- tungsten ore
- tunnel driving
- turbidimeter
- trenton rock
- trias
- triassic
- triatomic
- triaxial diagram
- tricarballylic
- trichloroacetic
- trichloronitromethane
- trickle hydrodesulfurization
- triclinic system
- tricosane
- tricyclic