Definition of "manjack"
manjack1
manjack2
noun
uncountable
(geology) A form of bitumen-rich asphalt found in Barbados and Trinidad.
Quotations
Oil-shales are often the last relics of a former impregnation with petroleum; they are associated with phenomena—such as the intrusive asphaltites or manjacks—common to petroliferous regions, but in many cases the parent oilfields, the sources of the former impregnation, are things of the past.
1922, Intermountain Industry and Engineering: Official Publication: Utah Motor Transport Ass'n, volume 24