par·a·sit·ism

[par-uh-sahy-tiz-uhm, -si-]
noun
1.
Biology. a relation between organisms in which one lives as a parasite on another.
2.
a parasitic mode of life or existence.
3.
Pathology. a diseased condition due to parasites.
4.
a.
unemployment or refusal to work.
b.
employment in work considered nonessential by the state.

Origin:
1605–15; parasite + -ism

non·par·a·sit·ism, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To parasitism
00:10
Parasitism is always a great word to know.
So is continuous variation. Does it mean:
variation in traits such as body weight or height in which a series of types are distributed on a continuum, not grouped into discrete categories
any modern theory of evolution holding that species evolve by natural selection acting on genetic variation
Collins
World English Dictionary
parasitism (ˈpærəsaɪˌtɪzəm) [Click for IPA pronunciation guide]
 
n
1.  the relationship between a parasite and its host
2.  the state of being infested with parasites
3.  the state of being a parasite

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

parasitism par·a·sit·ism (pār'ə-sĭ-tĭz'əm, -sī-)
n.
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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American Heritage
Science Dictionary
parasitism   (pār'ə-sĭ-tĭz'əm)  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Probably both: it was a case of symbiotic parasitism.
And in such a complete case of parasitism, even the former caterpillar's genome
  could have been reduced.
Evolutionarily, it seems to me that the best way to regard the marmoset story
  is as parasitism.
At first glance, this approach might seem to bear out the charge of parasitism.
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