Definition of pyrobitumen in English:

pyrobitumen

noun

Geology
  • Any of a class of bituminous hydrocarbons which differ from the bitumens proper in being relatively hard, infusible, and insoluble in organic solvents.

Origin

Mid 19th century (in an earlier sense). From pyro- + bitumen.

Pronunciation

pyrobitumen

/ˌpʌɪrə(ʊ)ˈbɪtʃʊmɪn//ˌpʌɪrə(ʊ)ˈbɪtjʊmɪn/