Webster's English Dictionary

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igneous

ig.ne.ous \'ig-ne--*s\ aj [L igneus, fr. ignis fire; akin to Skt agni fire] 
   1: of, relating to, or resembling fire : FIERY  2a: relating to, resulting 
   from, or suggestive of the intrusion or extrusi on of magma or the activity 
   of volcanoes 2b: formed by solidification of molten magma {~ rock}