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parasite ['pærəsaɪt] adj.
life.sc.	parasit
parasite Organism which lives and obtains food at the expense of another organism, the host adj.
environ.	parasit
English thesaurus
parasite ['pærəsaɪt] n
med.	Any organism that lives on or in another living organism the host and gets its food from or at the expense of the host. The host does not benefit from the parasite. Many parasites cause disease in humans. People with weakened immune systems, including people with HIV, are at a higher risk for parasitic infections than people with healthy immune systems.

parasite: 18 phrases in 7 subjects

Earth sciences	1
Fish farming pisciculture	1
General	2
Health care	7
Information technology	1
Medical	2
Natural sciences	4