BOTANIC MATERIA MEDICA, 481 
Tetraphyllous—tet’-ra-fil’-lus (Gr. zetra, four, 
and phullon, a leaf). A plant having four 
leaves. 
Thalssiophytes, plural, thal’-as-si-o-fits (Gr, 
thalasstos, belonging to the sea, and phouton, 
a plant). A term applied to the algze or sea- 
plants when speaking of them as a portion of 
the vegetable kingdom. 
Thallogen—thal’-o-jen (Gr. thallos, a young 
. Shoot, and gennao, I produce). A large class 
of the Cryptogami never showing a marked 
difference of root, stem or foliage. 
Thecca—the’-ca, plural, Thece (Gr. theca, a 
case or sheath). The sheath containing the 
reproductive matter of many flowerless 
plants, as the spore cases of the mosses. 
Theine—the’-in (Lat. thea; Fr. theine, the tea 
plant). The active principle of tea occurring 
in fine white needle-like crystals; used in 
medicine, 
T heobroma—the’-o-bro’-ma (Gr. theos, a god, 
and broma, food). A substance obtained from 
the chocolate nut; used as food, and used as 
coffee, etc. 
T herapeutics—ther’-a-pu’-tiks (Gr. therapeutt- 
kos, having the power of healing, from thera- 
euein, to heal), In medicine, the application 
of remedies to the cure of diseases, : 
Thistle—this’-1 (Icelandic, ¢histi//; Ger. distel, 
a thistle). The name applied to all varieties 
of prickly plants; the national emblem of 
Scotland. : 
Thyrsus—ther’-sus, also Thyrse ( Lat. thyrsus; 
Gr. thursos, a stalk or stem entwined with 
