noun
: a cutting tool for very hard materials (as gems) consisting of a metal disk that dips into a semifluid abrasive mixture as it revolves and carries it to the point of cutting
noun
: a cutting tool for very hard materials (as gems) consisting of a metal disk that dips into a semifluid abrasive mixture as it revolves and carries it to the point of cutting
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012