Trigonometric functions
trigonometric(al)
trigonometrical
trigonometry
trigonous
trigraph
trigynous
trihedral
trihedron
trihybrid
trijet
trike
trilateral
trilaterally
trilateration
trilby
trilby hat
trilinear
trilingual
triliteral
trilithon
trill
triller
trilling
trillion
trilobate
trilobed
trilobite
trilocular
trilogy