[par-uh-sahy-tiz-uh m, -si-] /ˈpær ə saɪˌtɪz əm, -sɪ-/
Biology. a relation between organisms in which one lives as a parasite on another.
a parasitic mode of life or existence.
Pathology. a diseased condition due to parasites.
  1. unemployment or refusal to work.
  2. employment in work considered nonessential by the state.
1605–15; parasite + -ism
Related forms
nonparasitism, noun
Example Sentences for parasitism
Yet parasitism is widespread and can affect behavior, reproduction and other aspects of the lives of hosts.
Chapman is trying to determine how nutrition and parasitism operate synergistically to influence primate population size.
Mortality is affected by bad weather, predation, parasitism and infectious diseases.
And in such a complete case of parasitism, even the former caterpillar's genome could have been reduced.
Dogs have not quite reached that point in their parasitism of human society.
At first glance, this approach might seem to bear out the charge of parasitism.
Probably both: it was a case of symbiotic parasitism.
All these are complicated questions, and unfortunately there's a lot of room for over-simplification and personal parasitism.
Evolutionarily, it seems to me that the best way to regard the marmoset story is as parasitism.
Scientists also will look at parasitism of songbird nests by cowbirds, predation and the reproductive success of songbirds.
British Dictionary definitions for parasitism
parasitism (ˈpærəsaɪˌtɪzəm)
1.  the relationship between a parasite and its host
2.  the state of being infested with parasites
3.  the state of being a parasite

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parasitism in Medicine

parasitism par·a·sit·ism (pār'ə-sĭ-tĭz'əm, -sī-)
A symbiotic relationship in which one species, the parasite, benefits at the expense of the other, the host.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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parasitism in Science
A symbiotic relationship in which one organism (the parasite) benefits and the other (the host) is generally harmed. Parasites derive nutrition from their host and may also gain other benefits such as shelter and a habitat in which to grow and reproduce. See more at parasite. Compare amensalism, commensalism, mutualism.

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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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