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parasitism

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Parasitism is a relationship between two different organisms where the parasite harms the host.

(noun)

When worms live in a dog and take nutrients from the dog, this is an example of parasitism.

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See parasitism in Webster's New World College Dictionary

noun

the state or condition of being a parasite
the habits of a parasite
in the U.S.S.R., the state of being unemployed
Biol. a symbiotic association of two kinds of organisms in which the parasite is benefited and the host is usually harmed
Med. the condition of being infested with parasites

See parasitism in American Heritage Dictionary 4

noun

The characteristic behavior or mode of existence of a parasite or parasitic population.
Parasitosis.

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