
1) Arthropod genus 2) Genus pyrophorus 3) Tropical click beetles
Found on
https://www.crosswordclues.com/clue/pyrophorus
[beetle] Pyrophorus (also known as Fire Beetles) is a genus of click beetle (family Elateridae). They are one of several genera in the tribe Pyrophorini, all of which are bioluminescent. Their bioluminescence is similar to that of another group of beetles, the fireflies, although click beetles do not flash, but remain constantly glowing (th...
Found on
http://en.wikipedia.org/wiki/Pyrophorus_(beetle)

substance that spontaneously combusts
Found on
http://phrontistery.info/p.html

• (n.) Any one of several substances or mixtures which phosphoresce or ignite spontaneously on exposure to air, as a heated mixture of alum, potash, and charcoal, or a mixture of charcoal and finely divided lead.
Found on
http://thinkexist.com/dictionary/meaning/pyrophorus/

(from the article `click beetle`) ...American click beetle, grows to 45 mm (over 1 34 in.) long and has two large black-and-white eyelike spots on the prothorax, a region behind the ...
Found on
http://www.britannica.com/eb/a-z/p/138
Py·roph'o·rus noun [ New Latin See
Pyrophorous .]
(Old Chem.) Any one of several substances or mixtures which phosphoresce or ignite spontaneously on exposure to air, as a heated mixture of alum, potash, and charcoal, or a mixture of charcoal and finely divided lead.
Found on
http://www.encyclo.co.uk/webster/P/205

[
n] - tropical click beetles
Found on
http://www.webdictionary.co.uk/definition.php?query=Pyrophorus
genus Pyrophorus noun tropical click beetles
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.