parasitism
noun
par·a·sit·ism
ˈper-ə-sə-ˌti-zəm
-ˌsī-,
ˈpa-rə-
1
: the behavior of a parasite
2
: an intimate association between organisms of two or more kinds
especially
: one in which a parasite obtains benefits from a host which it usually injures
3
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Merriam-Webster unabridged
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