Search Result for "parasitism": 
Wordnet 3.0

NOUN (1)

1. 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); 



The Collaborative International Dictionary of English v.0.48:

Parasitism \Par"a*si`tism\ (p[a^]r"[.a]*s[imac]`t[i^]z'm; 277),
   n. [Cf. F. parasitisme.]
   [1913 Webster]
   1. The state or behavior of a parasite; the act of a
      parasite. "Court parasitism." --Milton.
      [1913 Webster]

   2. (Bot. & Zool.) The state of being parasitic.
      [1913 Webster]


WordNet (r) 3.0 (2006):

parasitism
    n 1: 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)