- thrust-chamber nozzle
- tip moth
- triiron dodecacarbonyl
- triergolic
- triergol
- triergolic fuel
- triergolic rocket propellant
- triergolic propellant
- Trierweiler
- triethanolamine, TEA, TEOA
- triethylaluminium, TEA
- triethylamine, TEA
- triethylborane , TEB
- triethylborine , TEB
- triethylboron , TEB
- triethyl ether
- triethyl ethers
- triethylthallium
- trieuropium tetraoxide
- triflate
- trifluoroborane
- trifluoroacetic acid, TFA
- trifluoroethanoic acid, TFA
- trifluoromethanesulfonate
- triflic acid
- trifluoromethanesulfonic acid, TfOH
- trifluoromethylsulfonic acid, TfOH
- trifluorophosphane
- trifluorophosphine
- trifluorotoluene
- trifluperidol
- triflupromazine
- trifocal glass
- trigeminal neuralgia , TN
- trigeminal paralysis
- Trigger Man
- toggle circuit
- trigger coupling
