Definition of "pyrogenous" []

• Produced by fire or heat (adjective)
• Producing fire, heat, or fever (adjective)

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• "It is, however, much more common in alluvial grounds than among primitive and pyrogenous rocks."
• "I place pyroxenic amygdaloid and phonolite (porphyrschiefer) at the end of the formations of Venezuela, not as being the only rocks which I consider as pyrogenous, but as those of which the volcanic origin is probably posterior to the tertiary strata."
• "I consider as pyrogenous, but as those of which the volcanic origin is probably posterior to the tertiary strata."