BOTANIC MATERIA MEDICA. 407 
Arnica—ar’-ni-ka (Gr. arnion, a little lamb; 
from arna,alamb). So called from the re- 
semblance of the leaf to the soft coat or wool 
of the lamb. Leopard’s bane, the Arnica 
Montana. 
Aroma—a-ro'-ma (Gr. aroma; French, arome, 
the odor or fragrant principle of plants), 
Scent, perfume, etc. 
Artemesia—ar-te-mizh’-i-a (Gr. Artemis), One 
of the names of Diana in mythology. She 
is said to have presided over women in child- 
bed. Mother-herb, a genus of plants. Ex- 
amples: Wormwood and mugwort, etc. 
Asafeetida—as’-a-fet’-i-da (Lat. asa, a gum, 
and fetidus, foetid; Arabic, asa, healing), 
A gum resin; a medicine; the narthex asa- 
foetida. 
Asbestos—as-bes’-tos or asbestus (Gr. asbestos, 
unquenchable). A fibrous mineral of the 
Hornblende family, resembling fibres of flax, 
called rock-wood, rock-cork, mountain leather, 
ete. 
Archegonium—ar’-ke-go’-ni-um (Gr. arche, 
beginning; and gone, seed, generation). The 
female organ of reproduction in the flower- 
less plants. (Cryptogams.) 
Are—ar (Lat. area, an open place). A French 
measure of 100 sq. metres, or 119.60 sq. 
yards. ae : 
Ascidium—as-sid-i-um (Gr. askidion, a little 
bag). In botany, a form of leaf in which 
the stalk is hollowed out, and closed by the 
blade of the leaf like a lid. Example: the 
pitcher-plant leaf. 
