(adj) produced under conditions involving intense heat, Syn.pyrogenous, pyrogenic, Example: igneous rock is rock formed by solidification from a molten state; especially from molten magma; igneous fusion is fusion by heat alone; pyrogenic strata
(v) cause to start burning; subject to fire or great heat, Syn.light, Ant.extinguish, Example: Great heat can ignite almost any dry matter; Light a cigarette
a. [ L. ignescens, p. pr. of ignescere to become inflamed, fr. ignis fire: cf. F. ignescent. ] Emitting sparks of fire when struck with steel; scintillating; as, ignescent stones. [ 1913 Webster ]
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