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sinus
A cavity in a bone or other tissue. Commonly used to describe the cavities in the skull that open into…
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sinew
A tendon or fibrous cord.
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sigmoid
S-shaped.
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sickle cell trait
Inheriting the gene for sickle cell anemia from only one parent. It causes no symptoms.
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sickle cell anemia
A genetic condition characterized by abnormal red blood cells containing a defective form of hemoglobin. Sickle cell anemia occurs in…
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Siamese twins
Identical twins born joined together.
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shunt
To surgically divert the flow (such as of blood) from one organ or pathway to another.
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shoulder
The ball-and-socket joint connecting the arm with the body.
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shock
A disorder resulting from disruption of the circulation of the blood that can upset all body functions.
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shingles
A viral infection of certain sensory nerves that causes pain and blisters on the skin along the course of the…
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shigellosis
A diarrheal disease caused by Shigella bacteria.
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serum
The clear, yellowish-colored liquid portion of blood.
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serotonin
A chemical used to transmit information from one nerve cell to another.
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serology
The study of the antigen-antibody reaction.
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septum
A wall dividing an organ or cavity, as in the nose.
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sepsis
When disease-causing bacteria from an area of infection spread into the bloodstream and tissues.
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sensorium
The state of a person’s mental awareness.
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seminiferous
Carrying or producing semen.
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semicircular canals
The three loop-shaped tubular passages of the inner ear that control the sense of balance.
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semen
The ejaculate of the male consisting of sperm and secretions from the prostate, seminal glands and other glands.
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seizure
An attack of epilepsy.