Aqua. Water.
Areola. A circle around the nipple.
Areolar tissue. The tissue that connects various compound parts of the body.
Articulation. The joining or union of bones.
Artery. A vessel carrying blood from the heart.
Ascarides. Pin worms.
Ascites. Abdominal dropsy.
Asphyxia. Apparent death; suspended animation.
Assimulation. The process by which nutriment is converted into the substance of the body.
Asthenia. Want of strength; exhaustion; debility.