grinderPronunciation: /ˈgrʌɪndə/Translate grinder | into German | into Spanish Definition of grinder noun 1a machine used for grinding something:a coffee grinder a person employed to grind cutlery, tools, or cereals. 2a molar tooth. 3US informalanother name for hoagie.grinder in other Oxford dictionaries Definition of grinder in the US English dictionary