parasitism
par.a.sit.ism \'par-*-.si-t-.iz-*m\ n 1: the behavior of a parasite 2: an intimate association between organisms of two or more kinds; espX : one in which a parasite obtains benefits from a host which it usu. injures 3: PARASITOSIS
Webster's English Dictionarypar.a.sit.ism \'par-*-.si-t-.iz-*m\ n 1: the behavior of a parasite 2: an intimate association between organisms of two or more kinds; espX : one in which a parasite obtains benefits from a host which it usu. injures 3: PARASITOSIS