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parasite

par·a·site [ párrə st ] (plural par·a·sites)


noun 
Definition:
 
1. organism living on another: a plant or animal that lives on or in another, usually larger, host organism in a way that harms or is of no advantage to the host

2. scrounger: somebody who exploits others without doing anything in return

[Mid-16th century. Via Latin< Greek parasitos "somebody who eats from another's table" < sitos "grain, food"]
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