[par-uh-si-tahyz, -sahy-]
verb (used with object), parasitized, parasitizing.
to live on (a host) as a parasite.
Also, especially British, parasitise.

1885–90; parasite + -ize

unparasitized, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
parasitize or parasitise (ˈpærəsɪˌtaɪz, -saɪ-, ˈpærəsɪˌtaɪz, -saɪ-)
1.  to infest or infect with parasites
2.  to live on (another organism) as a parasite
parasitise or parasitise

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

parasitize par·a·sit·ize (pār'ə-sĭ-tīz', -sī-)
v. par·a·sit·ized, par·a·sit·iz·ing, par·a·sit·iz·es
To live on or in a host as a parasite.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
They used to be thought of solely as foreign intruders--strangers to the cells
  they invade and parasitize.
Brown-headed cowbirds parasitize open-cup nests of birds.
Since cowbirds rarely parasitize late season nests, this improves their
  possibility of raising a successful brood.
These new nematodes mate, after which the males die and the females begin
  searching for more fly hosts to parasitize.
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