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igneous (adj.)

1660s, "pertaining to or resembling fire," from Latin igneus "of fire, fiery; on fire; burning hot," figuratively "ardent, vehement," from ignis "fire, a fire," extended to "brightness, splendor, glow;" figuratively "rage, fury, passion," from PIE root *egni- "fire" (source also of Sanskrit agnih "fire, sacrificial fire," Old Church Slavonic ogni, Lithuanian ugnis "fire"). Geological meaning "produced by volcanic forces" is from 1791, originally in distinction from aqueous. Earlier in the sense "fiery" were ignean (1630s), ignic (1610s).

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Definitions of igneous

igneous (adj.)
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
Synonyms: pyrogenic / pyrogenous
igneous (adj.)
produced by the action of fire or intense heat;
rocks formed by igneous agents
Synonyms: eruptive
igneous (adj.)
like or suggestive of fire;
an igneous desert atmosphere
Synonyms: fiery
From wordnet.princeton.edu