Agent: (1) An active force or substance capable of producing an effect. For agents not listed here, see the specific name. (2) In disease, a factor such as a microorganism, chemical substance, or a form of radiation, the presence or absence of which (as in deficiency diseases) results in disease or in more advanced form of disease. [L. ago, pres. p. agens (agent-), to perform]
Source: Stedman's Medical Spellchecker, © 2006 Lippincott Williams & Wilkins. All rights reserved.
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