Webster's English Dictionary

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volcanic

1. vol.can.ic \va:l-'kan-ik, vo.l- also -'ka-n-\ \-i-k(*-)le-\ aj 1a: of or 
   relating to a volcano  1b: characterized by volcanoes  1c: made of 
   materials from volcanoes  2: explosively violent : VOLATILE  - 
   vol.can.i.cal.ly av
2. volcanic n : a volcanic rock