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Abarticulation (n) 1. The dislocation of a joint. 2. A synovial joint (see diarthrosis)

Abasia (n)
An inability to walk for which no physical cause can be identified. See also astasia

Abdomen (n)
The part of the body cavity below the chest (see thorax), from which it is separated by the diaphragm. The abdomen contains the organs of digestion—stomach, liver, intestines, etc.—and excretion – kidneys, bladder, etc.; in women it also contains the ovaries and uterus.

Abdomin- (abdomino-)
Combining form denoting the abdomen. Examples: abdominalgia (pain in the adomen); Abdominothoracic (relating to the abdomen and thorax).

Abducens Nerve
The 6th cranial nerve (VI), which supplies the lateral rectus muscle of each eyeball, responsible for turning the eye outward.

Abduct (vb)
To move a limb or any other part away from the midline of the body—Abduction (n)

Abductor (n)
Any muscle that moves one part of the body away from another or from the midline of the body.

Aberrant (adj)
Abnormal: usually applied to a blood vessel or nerve that does not follow its normal course.

Aberration (n) (in optics)
A defect in the image formed by a lens. In chromatic aberration the image formed by a lens has colored fringes as a result of the different extent to which light of different colors is refracted by glass. It is corrected by using an achromatic lens. In spherical aberration, the image is blurred because rays from the object come to a focus in slightly different positions as a result of the curvature of the lens; the rays passing more peripherally through the lens are bent more than those passing through centrally. This occurs even with monochromatic light.


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