pyrotoxin
/ˈpʌɪrə(ʊ)tɒksɪn/noun
1 Medicine. A pyrogen; specifically a pyrogenic bacterial toxin. Now rare.
2A toxic substance, especially an environmental pollutant, produced by combustion (including natural fires).
Origin
Late 19th century; earliest use found in The Lancet. From pyro- + toxin.