parasitism
par·a·sit·ism
noun \ˈpar-ə-sə-ˌtiz-əm, -ˌsīt-ˌiz-\Definition of PARASITISM
1
: 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
2
Learn More About
Seen & Heard 
What made you want to look up parasitism? Please tell us where you read or heard it (including the quote, if possible).
