Medical Dictionary

parasite par·a·site (pār'ə-sīt')

  1. An organism that grows, feeds, and is sheltered on or in a different organism while contributing nothing to the survival of its host.

  2. In conjoined twins, the usually incomplete twin that derives its support from the more nearly normal fetus.

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