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Definition of Parasite

Parasite: A plant or an animal organism that lives in or on another and takes its nourishment from that other organism. Parasitic diseases include infections that are due to protozoa, helminths, or arthropods. For example, malaria is caused by Plasmodium, a parasitic protozoa.

Source: MedTerms™ Medical Dictionary
Last Editorial Review: 3/19/2012

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