sharpening stone

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shar·pen·ing stone

(shahrpĕn-ing stōn)
Natural or synthetic stone composed of abrasive particles used to restore a sharp cutting edge on a calculus removal instrument.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
Caption: Figure 6: Relation between AC-16 rotation stability factor and oilstone.
This time, they're joined by a new member, Dr Gravamen Oilstone. "There are certain things in the show that are potentially dangerous, and his role is to ensure that the audience is safe."
For 25 years, I've been struggling with my trusty old oilstone to achieve the elusive razor-sharp edge.