pyrogenous

[pahy-roj-uh-nuh s]

adjective Geology.

Origin of pyrogenous

First recorded in 1830–40; pyro- + -genous

Pyrogenous oil of turpentine is another cheap and good solvent.
Cooley's Cyclopdia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades..., Sixth Edition, Volume I
Arnold Cooley
Gold is, however, much more common in the alluvial grounds than among the primitive and pyrogenous rocks just described.
A Dictionary of Arts, Manufactures and Mines
Andrew Ure
It is, however, much more common in alluvial grounds than among primitive and pyrogenous rocks.
The Continental Monthly, Vol 3 No 3, March 1863
Various