sharpening stone

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Related to oilstone: whetstone

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.
References in periodicals archive ?
These are used to produce abrasive tools, deburring media, grinding stones, hones, oilstones, stone files, tube-mill liners and whetstones.
I've wit unsuccessfully tried jigs, grinding wheels, oilstones, sandpaper and water stones.
There are two basic types of whetstones: oilstones and waterstones.