From Longman Dictionary of Contemporary Englishgrindergrind‧er /ˈɡraɪndə $ -ər/ noun [countable] DFUa machine for crushing coffee beans, peppercorns etc into powder
Examples from the Corpus
grinder• The grocer had a grinder somewhere, and his wife unearthed it, dusted it down and plugged it in for me.• a coffee grinder• Counters get completely covered with waffle irons, toaster ovens and coffee grinders.• Getting feedback about your writing can be as pleasant as poking your finger into a food grinder.• His voice churned like a meat grinder that had long been abused by its owner.• Damaged discs or grinders can be very hazardous and gloves and goggles must be worn.• Do not hold the grinder back to front, and never remove the guard.• Lewis said deputies did not want to risk injuring the protesters by using grinders to cut through their metal sleeves. 