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 strata

[ Syn: pyrogenic , pyrogenous ]

produced by the action of fire or intense heat; rocks formed by igneous agents

[ Syn: eruptive ]

like or suggestive of fire; a fiery desert wind; an igneous desert atmosphere

[ Syn: fiery ]