Definition of Gilsonite in English:

Gilsonite

noun

trademark
  • [mass noun] A very pure, shiny, brittle black form of asphalt, used in making inks, paints, and varnishes.

    • ‘A general guideline is that 3% binder replacement with Gilsonite will double the viscosity of a binder.’
    • ‘In the 1990s the state led the nation in beryllium and Gilsonite production.’

Origin

Late 19th century: named after Samuel H. Gilson, 19th-century American mineralogist, + -ite.

Pronunciation:

Gilsonite

/ˈɡɪlsənʌɪt/