Aphakia
Aphakia: Absence or loss of the eye’s natural crystalline lens, as after cataract removal.
From a-, without + phacos, the Greek word for a lentil bean. The ancients thought (quite correctly) that the lens of the eye was shaped like a lentil bean.
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- Aphasia
Literally, no speech. Aphasia may also be used to describe defects in spoken expression or comprehension of speech.
- Apheresis
The process of removing a specific component from blood temporarily. Also known as hemapheresis and pheresis. Forms of apheresis include plasmapheresis, harvesting plasma or liquid part of the blood; leukapheresis, harvesting leukocytes or white blood cells; granulocytapheresis, harvesting granulocytes; lymphocytapheresis, harvesting lymphocytes; lymphoplasmapheresis, harvesting lymphocytes and plasma; and plateletpheresis, harvesting platelets.
- Aphthous ulcer
Aphthous ulcer: A small sensitive painful ulcer crater in the lining of the mouth. Commonly called a canker sore. Picture of a canker sore Aphthous ulcers are one of the most common problems that occur in the mouth. About 20% of the population (1 in 5 people) have aphthous ulcers at any given time. Aphthous […]
- Apical
Apical: The adjective for apex, the tip of a pyramidal or rounded structure, such as the lung or the heart. For example, an apical lung tumor is a tumor located at the top of the lung.
- Apiphobia
Apiphobia: Fear of bees. A phobia is an unreasonable sort of fear that can cause avoidance and panic. Phobias are a relatively common type of anxiety disorder. Phobias can be treated with cognitive behavioral therapy using exposure and fear reduction techniques. In many cases, anti-anxiety or anti-depressant medication proves helpful, especially during the early stages […]