parasite

Popular Terms
Organism obtaining nourishment from or living one another organism (the 'host') for survival and usually harming it and causing disease. Some parasites are independent and some depend entirely on their hosts and separate only when either one of them dies. Human parasites include bacteria, fungi, lice, viruses, and worms. See also symbiosis.

Use 'parasite' in a Sentence

Bob was seen as the office parasite because he would wait outside of conference rooms where lunch was being served to get food for himself when the meeting were over.
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When the parasite attached itself to the host, it reduced it's quality of life by means of infections and disease, relying completely on the host for all of its nourishment.
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There are many parasites that can infect a person and the tv show The Monster Inside Me does a good job of showcasing some of the more obscure ones.
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