African trypanosomiasis, also known as sleeping sickness, is a tropical disease caused by parasites of the Trypanosoma genus.

Albert Sabin (born Abram Sabin) was a Polish-American medical researcher and virologist who is best known for developing the oral polio vaccine.

Alois Alzheimer was a German psychiatrist and neuropathologist who is credited with discovering the first case of what is now known as Alzheimer's disease.

Ammonia is a compound composed of one nitrogen atom bonded to three hydrogen atoms.

Andreas Vesalius was a physician, anatomist, and author who made significant contributions to the field of human anatomy during the Renaissance.

An anesthetic is a substance that induces anesthesia, a state of temporary loss of sensation and awareness.

Avicenna, also known as Ibn Sina, was a renowned Persian physician, philosopher, and scientist who lived during the Islamic Golden Age.