The definition of a parasite is a person or organism that takes from or exploits others, giving nothing in return.
(noun)See parasite in Webster's New World College Dictionary
noun
Origin: L parasitus < Gr parasitos, one who eats at the table of another, parasite, toady < para-, beside (see para-) + sitos, food, grain
See parasite in American Heritage Dictionary 4
noun
Origin:
Origin: Latin parasītus, a person who lives by amusing the rich
Origin: , from Greek parasītos, person who eats at someone else's table, parasite
Origin: : para-, beside; see para-1
Origin: + sītos, grain, food
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