anise
Aromatic Mediterranean herb (Pimpinella anisum) in the parsley family,
cultivated for its seed-like fruits and the oil; used to flavor foods,
liqueurs, and candies.

anodyne
Relieves pain.

antipyrine (antipyrin, phenazone)
Analgesic and antipyretic (reduces fever) C11H12N2O formerly used, but
now largely replaced by less toxic drugs such as aspirin.

antrum
Cavity or chamber, especially in a bone. Sinus in the bones of the upper
jaw, opening into the nasal cavity.

apomorphine
Poisonous white crystalline alkaloid, C17H17NO2, derived from morphine
and used to induce vomiting.

arnica
Perennial herbs of the genus Arnica. Tincture of the dried flower heads
of the European species A. montana, applied externally to relieve the
pain and inflammation of bruises and sprains.

articular
Relating to joints: the articular surfaces of bones.

asafetida (asafoetida)
Fetid (offensive odor) gum resin of Asian plants of the genus Ferula