pyrobituminousadj.
/ˌpʌɪrə(ʊ)bᵻˈtjuːmᵻnəs/, /ˌpʌɪrə(ʊ)bᵻˈtʃuːmᵻnəs/, U.S. /ˌpaɪroʊbaɪˈt(j)umənəs/, /ˌpaɪroʊbəˈt(j)umənəs/ Geology.
Containing, consisting of, or having the character of pyrobitumen.
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pyrobituminous1869
1869 Proc. Amer. Philos. Soc. 1865–8 10 446 It has been supposed to be the product of the natural distillation of pyrobituminous shales and coals.
1918 H. Abraham Asphalts xi. 149 They [sc. pyrobitumens] are grouped into five classes, viz.: elaterite, wurtzilite, albertite, impsonite, and asphaltic pyrobituminous shales.
1937 Bull. Amer. Assoc. Petroleum Geologists 21 122 Regardless of the possible economic value of the Brazilian algal deposits and other pyrobituminous sediments, those now forming in fresh-water ponds and the related geologically young deposits have great scientific interest.
1970 Amer. Jrnl. Bot. 57 783/1 The processes that the..lake sediment went through before arriving at..the hard, chemically inert, pyrobituminous organic matter of oil shale.
This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).
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adj.1869