• synonyms


[par-uh-si-tahyz, -sahy-]
verb (used with object), par·a·si·tized, par·a·si·tiz·ing.
  1. to live on (a host) as a parasite.
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Also especially British, par·a·si·tise.

Origin of parasitize

First recorded in 1885–90; parasite + -ize
Related formsun·par·a·si·tized, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for parasitize

Historical Examples

  • Primary larvae of the parasite failed to parasitize Supella.

    The Biotic Associations of Cockroaches

    Louis M. Roth

  • Two roundworms were found to parasitize the guts of the salamanders; the parasitism looks to be benign.

British Dictionary definitions for parasitize



verb (tr)
  1. to infest or infect with parasites
  2. to live on (another organism) as a parasite
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

parasitize in Medicine


(părə-sĭ-tīz′, -sī-)
  1. To live on or in a host as a parasite.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.