thymol
White, crystalline, aromatic compound, C10H14O, derived from thyme oil
and other oils or made synthetically and used as an antiseptic, a
fungicide, and a preservative.

tolu (balsam of tolu, tolu balsam)
Aromatic yellowish brown balsam from the tolu balsam tree used in cough
syrups.

tormentil (Potentilla erecta)
Plant of northern Europe found in clearings and meadows. The root has
been used to stop bleeding, for food in times of need and to dye leather
red.

torpid
Lacking the power of motion or feeling.

tragacanth
Thorny shrubs of the genus Astragalus, especially A. gummifer, of the
Middle East, yielding a gum used in pharmacy, adhesives, and textile
printing.

trephine
Surgical instrument with circular edges, used to cut out disks of bone
from the skull.

trillium (birthroot, wake-robin)
Plants of genus Trillium, of North America, the Himalaya Mountains, and
eastern Asia, having a cluster of three leaves and a variously colored,