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ev, eV, EV

electron volt.


enlargement of the vestibular aqueduct.


(ē-văk′ū-ănt) [L. evacuans, making empty] A drug that stimulates the bowels to move. A laxative.


(ĭ-văk′ū-āt″) [L. evacuatio, emptying] 1. To discharge, esp. from the bowels; to empty the uterus. 2. To move patients from the site of an accident or catastrophe to a hospital or shelter.


(ē-văk″ū-ā′shŭn) 1. The act of emptying, e.g., the bowels. In obstetrics, the term refers to emptying the uterus of the products of conception, as in abortion or removal of retained placental fragments. 2. The material discharged from the bowels; stool. 3. Removal of air from a closed container; production of a vacuum. 4. The act of moving people to a safe place, esp. from a disaster or a war-torn area.

air e. Transport of patients from one location to another by specially equipped helicopters or other aircraft. Indications for air transport include severe trauma, burns, and other conditions requiring immediate skilled care and treatment.


(ē-văk′ū-ā-tor) A device for emptying, as the bowels, or for irrigating the bladder and removing calculi.


(ĕ-vaj-ĭ-nā′shŏn) 1. Emergence from a sheath. 2. Protrusion of an organ or part. SYN: outpocketing. SEE: invagination. evaginate (ĕ-vaj-ĭ-nāt″), adj.


(ĕ-val″ū-ā′shŏn) [Fr evaluation] 1. A rating or assessment, e.g., of the accuracy of a diagnosis, the effectiveness of a plan of care, or the quality of care. 2. An appraisal of the health or status of an individual, based on specific criteria. 3. A clinical judgment. SEE: nursing assessment; nursing intervention; nursing process; planning; problem-oriented medical record.

evaluation and management coding

ABBR: E&M coding. In U.S. health care, a system of medical billing that health care providers must use for reimbursement by Medicare, Medicaid, or private insurance carriers.


(ĕv″ă-nĕs′ĕnt) [L. evanescere, to vanish] Not permanent; of brief duration.

Evans blue

(ĕv′ănz) [Herbert M. Evans, U.S. anatomist, 1882–1971] A diazo dye occurring as a blue-green powder, very soluble in water. It is used intravenously as a diagnostic agent.

Evans syndrome

[Robert S. Evans, U.S. physician, b. 1912] An autoimmune disease characterized by thrombocytopenia and hemolytic anemia.


(i-vap″ŏ-rā′shŏn) [L. evaporare, to disperse in steam] 1. Change from liquid to vapor. 2. Loss in volume due to conversion of a liquid into a vapor. evaporate (i-vap′ŏ-rāt″), v. evaporative (i-vap′ŏ-rāt″iv), adj.



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