1) Fever-inducing 2) Matter 3) Pyrogenetic 4) Pyrogenous 5) Substance 1) Igneous 2) Pyrogenetic 3) Pyrogenous 
• (a.) Producing heat; -- said of substances, as septic poisons, which elevate the temperature of the body and cause fever.
(pyro- + Gr. gennan to produce) inducing fever.
<physiology> Fever inducing. ... Origin: Gr. Gennan = to produce ... (18 Nov 1997) ... 
(pi″ro-jen´ik) causing fever; called also pyretic.
Fever-inducing.Causing fever. See pyrogen.
Pyr`o·gen'ic adjective [ Pyro- + -gen + -ic .] (Physiol.) Producing heat; -- said of substances, as septic poisons, which elevate the temperature of the body and cause fever. 
Type: Term Pronunciation: pī′rō-jen′ik Definitions: 1. Causing fever. Synonyms: pyretogenetic, pyretogenic, pyretogenous
[adj] - produced by or producing fever
pyrogenous adjective 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`; `pyrogenic strata`
producing or produced by heat or fever. · produced by heat, as the anhydrous minerals of an igneous rock.