Etymology
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parasitism (n.)

"a habitual living on or at the expense of another," 1610s, from parasite + -ism. Biological sense of "vital relation of a parasite to a host" is by 1840.

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Definitions of parasitism

parasitism (n.)
the relation between two different kinds of organisms in which one receives benefits from the other by causing damage to it (usually not fatal damage);
From wordnet.princeton.edu