WordWeb Online

1. Produced under conditions involving intense heat
   "igneous rock is rock formed by solidification from a molten state; especially from molten magma"; "igneous fusion is fusion by heat alone"
   - pyrogenic, pyrogenous
    
2. Produced by the action of fire or intense heat
   "rocks formed by igneous agents"
   - eruptive
    
3. Like or suggestive of fire
   "an igneous desert atmosphere"
   - fiery

See also: heat, hot

Antonym: aqueous

Encyclopedia: Igneous