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xenoparasite

[zĕn′ə-păr′ə-sīt′, zē′nə-]

n.

An ectoparasite that becomes pathogenic when the resistance of its host weakens.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.