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. 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. b. A mechanical device that grinds: a meat grinder. 2. A molar. 3. grinders Informal The teeth. 4. See submarine sandwich. American Heritage® Dictionary of the. Navigation menu Personal tools Not logged in Talk Contributions Create account Log in. A mechanical device that grinds: Recent Examples of grinder from the Web Or pulse them a few times in a clean coffee grinder. Meaning "machine for milling" spiele free download from s; of persons, from late 15c. While both investors achieved the same results, the grinder did so by conducting transactions at a large volume while the other investor did not.