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A grinding machine, often shortened to grinder, is any of various power tools or machine tools used for grinding, which is a type of machining using an abrasive wheel as the cutting tool. Each grain of abrasive on the wheel's surface cuts a small chip from the workpiece via shear deformation.
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.