- thermae
- thermalgesia
- thermocaustica
- thermocauter
- thermocauterectomia
- thermocoagulatio
- thermodilutio
- thermolabilis
- thermolabilitas
- thermonuclearis
- thermoplegie
- thermoreceptor
- thermoregulatio
- thermos
- thermostabilis
- thermotaxis
- these
- thésis
- théta
- théti
- thiaminum
- thick description
- thigmotaxis
- thing
- thinking skills
- think-tenk
- thio(pneumo)coniosis
- thioalkoholy
- thioly
- thiolýza
- thiopege
- thiopentalum
- third - person effect
- thixophobia
- thoracalgia
- thoracalis
- thoracobronchotomia
- thoracodynia
- thoracolaparotomia
- thoracomyodynia
- thoracopagus
- thoracoplastica
- thorakalgie
- thorium
- thrash
- threat
- thrichiasis
- thriller
- thrix
- thromb(o)embolia