from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A natural black bitumen used in the manufacture of acid, alkali, and waterproof coatings.
from The Century Dictionary and Cyclopedia
- n. Gilsonite; a black, brilliant, and lustrous variety of bitumen giving a dark-brown streak, breaking with a beautiful conchoidal fracture, and having a hardness of from 2 to 2.5 and a specific gravity of from 1.065 to 1.07. It is easily fusible, dissolves in turpentine, and is used in making varnishes and in coverings for electric insulation.
After the Uinta (Mountains) .(American Heritage® Dictionary of the English Language, Fourth Edition)