Pyrophorus

from WordNet (r) 3.0 (2006)

Pyrophorus
    n 1: tropical click beetles [syn: {Pyrophorus}, {genus
         Pyrophorus}]

from The Collaborative International Dictionary of English v.0.48

Pyrophorus \Py*roph"o*rus\, n. [NL. 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.
   [1913 Webster]