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xenoparasite

(zĕn′ə-păr′ə-sīt′, zē′nə-)
n.
  1. An ectoparasite that becomes pathogenic when the resistance of its host weakens.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.