igneous

adjectives

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"
pertains to
produced by the action of fire or intense heat
"rocks formed by igneous agents"
antonym
like or suggestive of fire
"a fiery desert wind"; "an igneous desert atmosphere"