a spherical mass of mineral and plant material embedded in coal beds, ranging in size from that of a pea to that of a boulder.
[kohl-bin] /ˈkoʊlˌbɪn/ noun 1. a used for holding .
noun 1. a railroad car designed to carry coal. 2. a car for hauling coal in or from a mine.
noun 1. a machine for cutting a kerf, especially in longwall mining.
[koh-ler] /ˈkoʊ lər/ noun 1. a railroad, ship, etc., used mainly to haul or supply . /ˈkəʊlə/ noun 1. a ship, train, etc, used to carry or supply coal 2. a person who sells or supplies coal