igneous igneous /ˈɪgniːəs/

adjective

1. Like or suggestive of fire  ( igneous , fiery )
   like or suggestive of fire
    A fiery desert wind
   a fiery desert wind
    An igneous desert atmosphere
   an igneous desert atmosphere
   
2. (geology) produced by the action of fire or intense heat  ( eruptive , igneous )
   (geology) produced by the action of fire or intense heat
    Rocks formed by igneous agents
   rocks formed by igneous agents
   
3. Produced under conditions involving intense heat  ( igneous , pyrogenic , pyrogenous )
   produced under conditions involving intense heat
    Igneous rock is rock formed by solidification from a molten state; especially from molten magma
   igneous rock is rock formed by solidification from a molten state; especially from molten magma
    Igneous fusion is fusion by heat alone
   igneous fusion is fusion by heat alone
    Pyrogenic strata
   pyrogenic strata