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| the subdivision of an organism or of an organ into more or less equivalent parts; cell division |
| a grouping of tissues into a distinct structure, as a heart or kidney in animals or a leaf or stamen in plants, that performs a specialized task |
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.
| 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. |