Home › Words › P › pyrobitumenpyrobitumenpyrobitumen means an amorphous fossilized petroleum mineraloid.Among words judged in Lexicurio's Arena, pyrobitumen ranks #11,969 of 42,749 for Qualifying.EtymologyFrom pyro- + bitumen.nounAn amorphous fossilized petroleum mineraloid.Definitions & examples from Wiktionary (CC BY-SA 3.0).