Ætiology. The science of causes.

Ala. A wing.

Ala Nasi. The cartilaginous sides of the nose which move during difficult breathing.

Albuminoid. Resembling albumen.

Albuminaria. The presence of albumen in the urine. A kidney disease.

Alkalies. Substances that have the power of forming salts with acids.

Alimentary Canal. The passage from the mouth to the anus.

Alterative. A medicine that has power to gradually change or improve a disease.

Alveoli. The bony sockets of the teeth.

Amenorrhœa. A suspension or absence of the menses.