Transversus
L. transversus = crosswise, used, to describe both muscles, as well as pathologies such as a myelitis extending across the cord.
Trapezius
Gr. trapeza = a table. Originally a contraction of tetrapeza = four-legged.
Tricuspid
L. tri = three, and cuspis = point or sail. Applied to the heart valve that has three leaflets.
Trigone
Gr. trigonon, from tri = three, and gonia = angle. Used to describe several anatomical triangles (e.g. in the urinary bladder, trig. sternocostale etc.).
Trochanter
Gr. trochanter = a runner; derived from trochos = a wheel. The name of the processes below the neck of the femur.
Tubercule
L. tuber = a knot or collection, and -culum = a diminutive suffix.
Tuberosity
L. tuber = knob or localized collection, and -osity = condition.