Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «S»:
Seborrhea: A chronic inflammatory disease of the skin characterized by the accumulation of scales of greasy skin. There may be yellow crusted patches that are itchy. Seborrhea often affects the scalp. Other sites include the face, ears, eyebrows and eyelids, umbilicus, and genitalia, Seborrhea of th...
Seborrheic dermatitis: A medical name for what is popularly called seborrhea....
Seborrheic eczema: Yellowish, oily, scaly patches of skin on the scalp, face, and occasionally other parts of the body....
Seborrheic keratosis: See: Keratosis, seborrheic....
Sebum: An oily secretion of the sebaceous gland which
helps to preserve the flexibility of the hair....
Seckel syndrome: A birth defect syndrome with
severe short stature and, characteristically, low birth
weight, very small head (microcephaly), receding
forehead, large eyes, low ears, prominent beaklike
protrusion of the nose, and smallish chin. Defects of bones
in the arms and legs, dislocation...
Second cranial nerve
Second cranial nerve: The second cranial nerve is the
optic nerve, the nerve that connects the eye to the brain and carries
the impulses formed by the retina -- the nerve layer that lines the
back of the eye, senses light and creates the impulses -- to the
brain which interprets them as images....
Second degree burn
Second degree burn: See: Burn, second degree....
Second stage of labor
Second stage of labor: The part of labor from the full dilatation of
the cervix until the baby is completely out of the birth canal. The second stage of labor
is also called the stage of expulsion....
Second wave: A phenomenon of infections that can develop during a pandemic. The disease infects one group of people first. Infections appear to decrease. And then, infections increase in a different part of the population, resulting in a second wave of infections....
Second-hand smoke: Environmental tobacco smoke that is inhaled involuntarily or passively by someone who is not smoking.
Environmental tobacco smoke is generated from the sidestream (the burning end) of a cigarette, pipe or cigar or from the exhaled mainstream (the smoke puffed out by smokers) of ci...
Secondary amenorrhea: The abnormal cessation of
menstruation. Amenorrhea is
conventionally divided into primary and secondary
. With primary
amenorrhea, menstruation never takes place. It fails to
occur at puberty.
With secondary amenorrhea, menstruation starts but then
stops. The absence
Secondary amyloidosis: One of a group of diseases (called amyloidosis) in which protein deposits (amyloid) accumulate in one or more organ systems in the body, secondary amyloid is caused by a chronic infection or inflammatory disease such as rheumatoid arthritis, familial Mediterranean fever, osteo...
Secondary atelectasis: Partial or total collapse of a lung or a segment of a lung that was once expanded, as may happen after chest surgery. Secondary atelectasis is in contrast to primary atelectasis in which there is failure of the lung to expand fully at birth....
Secondary cataract: See: Cataract, secondary....