BOTANIC MATERIA MEDICA, 427 
Didynamous—di-din’-a-mus (Gr. dis, twice, and 
dunamos, twin,double). Plants, flowers,seeds, 
growing in pairs, or twined; botanical class, 
to which belong flowers having two long and 
two short stamens, as in the class Didyna- 
mia, 
Dimerous—dim’-er-us (Gr. dts, twice, and 
meros, a part). Composed of two pieces. 
Dicecian—di-esh'i-an; also Dicecious (Gr. ds, 
twice, and ozkos, a house, both words pertain- 
ing to dicecia), Plants of a class having male 
flowers on one plant and female on another 
of the same kind. 
Dipetalous—di-pet’-a-lus (Gr. dis, twice, and 
petalon, a petal). Flowers having only two 
petals, 
Diphyllous—di-fil’-lus (Gr. dis, twice, and phul- 
fon, aleaf). Plants having only two leaves. 
Disk—(Lat. discus, a quoit). In botany, the 
centreor fleshy expansion between thestamens 
and pistils, or the flat button-like portion of a 
flower after the stamens and pistils have been 
taken off; also the leaf between the edges 
known as the limb of the leaf. 
Dissect—dis’-seckt (Lat. dissectum, form, dzs, 
asunder, and sectus, to cut). The cutting up 
or separating the parts of a plant. 
Dodecandrous—do’-dek-an-drus Gr. dodeka, 
twelve, and aver, a man, genitive, andros). 
A class of plants whose flowers have twelve 
stamens. 
Drastic—dras’-tic (Gr. drasticos, active, vigor- 
ous, from draco, 1 door act, and the French 
drastique). A powerful,astrong-acting drug; 
