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A coker unit is a thermal cracking process in the oil refinery industry used to recover valuable elements, the most important of which being petroleum coke from main refinery process residues.
Top Definition. grinder. a container filled with small nails or little poles fitted into the insides to help grind marijuana up to make rolling blunts easier. Will often come with a keef screen so you can pack keef on top. i bought a grinder in haight today so i can roll my bud easier.