Webster's New World Medical Dictionary

eight-day measles
Rubeola (measles). See also
measles.
ejaculation
Ejection of sperm and seminal fluid
during an orgasm in a male.
ejection fraction
The percentage of blood that is
pumped out of a filled ventricle as a result of a
heartbeat. The heart does not eject all the blood in
the ventricle. Only about two-thirds of the blood is
normally pumped out with each beat, and that frac-
tion is referred to as the ejection fraction. The ejec-
tion fraction is an indicator of the heart’s health. If
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ejection fraction
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the heart is diseased from a heart attack or another
heart condition, the ejection fraction may decrease.
EKG
Electrocardiogram.
elbow
The juncture of the long bones in the mid-
dle portion of the upper extremity. The bone of the
arm (humerus) meets both the ulna (the inner bone
of the forearm) and radius (the outer bone of the
forearm) to form a hinge joint at the elbow. The
radius and ulna also meet one another in the elbow
to permit a small amount of rotation of the forearm.
The elbow therefore functions to move the arm like a
hinge (forward and backward) and in rotation (out-
ward and inward). The biceps muscle is the major
muscle that flexes the elbow hinge, and the triceps
muscle is the major muscle that extends it. The pri-
mary stability of the elbow is provided by the ulnar
collateral ligament, located on the medial (inner)
side of the elbow. The outer bony prominence of the
elbow is the lateral epicondyle, a part of the humerus
bone. Tendons attached to this area can be injured,
causing inflammation or tendonitis (lateral epi-
condylitis, or tennis elbow). The inner portion of the
elbow is a bony prominence called the medial epi-
condyle of the humerus. Additional tendons from
muscles attach here and can be injured, likewise
causing inflammation or tendonitis (medial epi-
condylitis, or golfer’s elbow).