Temporary unconsciousness resulting from a blow to the head. It is often followed by amnesia for events immediately preceding the blow.
convulsion / kənvəlʃn̩ /
Series of violent contractions of the muscles over which the patient has no control. It may be associated with loss of consciousness. Convulsions may arise from any one of a number of causes, including brain disease (such as epilepsy), injury, high fever, poisoning, and electrocution.
ETYM Latin percussio: cf. French percussion. Related to Percuss.
1. Tapping a part of the body for diagnostic purposes.
2. The act of exploding a percussion cap.
3. The act of playing drums; SYN. drumming.
In medicine, the technique of exploring the body by tapping it with the fingers or an instrument. The nature of the vibrations felt may indicate some abnormality, such as the presence of fluid in the lungs.
Unit of time equal to a hundred-millionth of a second, used in describing nuclear processes.
In music, an alternate name for trill, in which two adjacent notes rapidly alternate.
1. The act or result of shaking; a vacillating or wavering motion; a rapid motion one way and other; a trembling or quaking.
2. A fissure or crack in timber, caused by its being dried too suddenly.
3. A fissure in rock or earth.
4. A milkshake.
In medicine, circulatory failure marked by a sudden fall of blood pressure and resulting in pallor, sweating, fast (but weak) pulse, and sometimes complete collapse. Causes include disease, injury, and psychological trauma.
In shock, the blood pressure falls below that necessary to supply the tissues of the body, especially the brain. Treatment depends on the cause. Rest is needed, and, in the case of severe blood loss, restoration of the normal circulating volume.
1. Any violent blow or collision; SYN. concussion.
2. The violent interaction of individuals or groups entering into combat; SYN. impact.
3. An unpleasant or disappointing surprise; SYN. blow.
4. (Pathology) Bodily collapse or near collapse caused by inadequate oxygen delivery to the cells; caused by loss of circulating blood or cardiac arrest or obstruction or poor distribution of the blood flow.
5. A bushy thick mass (especially hair)
6. A pile of sheaves of grain set on end in a field to dry; stalks of Indian corn set up in a field.
7. An instance of agitation of the earth's crust; SYN. seismic disturbance.
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