Search Result for "volcanism": 
Wordnet 3.0

NOUN (1)

1. the phenomena associated with volcanic activity; 



The Collaborative International Dictionary of English v.0.48:

Volcanism \Vol"can*ism\, n.
   Volcanic power or action; volcanicity.
   [1913 Webster]


WordNet (r) 3.0 (2006):

volcanism
    n 1: the phenomena associated with volcanic activity