adjective
1. produced under conditions involving intense heat
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igneous rock is rock formed by solidification from a molten state; especially from molten magma
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igneous fusion is fusion by heat alone
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pyrogenic strata
2. produced by or producing fever
• Syn: ↑pyrogenic, ↑pyrogenetic
• Derivationally related forms: ↑pyrogen
Useful english dictionary. 2012.