(n.) A variety of hone slate, or whetstone, used for whetting tools when lubricated with oil.

A acerbity acidity acidulousness acme acridity acrimony acuity aculeate acuminate acumination acuteness adjoin advantage air line allowance alpha anxious apex apogee apprehensive asperity astringency axis bank barb beeline befringe beginning bind bite bitingness bitterness blast-off board border bordure bound boundary bourn brim brink brow bulge cap causticity chord climax cloud nine coast coign of vantage commencement crabbed crawl creation creep crest crown culmen culmination cuspidate cut cutting edge cuttingness dawn deadwood diagonal diameter direct line directrix draw drop edge tool edgy effectiveness end enframe establishment extreme limit extremity featheredge fidgety fierceness file flange flank flying start force foundation frame fresh start fringe go crabwise go sideways great-circle course grind grip handicap harshness head start heaven heavens height hem high noon highest pitch highest point hone ill at ease inch incisiveness inside track institution irascible irritable jump jump-off keenness kick-off knife-edge labellum labium labrum lap lateral lateralize lead leading edge ledge limb limbus limit line lip list make leeway march marge margin marginate maximum meridian mordacity mordancy mountaintop move mucronation ne plus ultra nervous new departure no place higher noon normal odds oilstone on edge on tenterhooks oncoming onset opening origin origination outbreak outline outset peak peevish penetration perimeter periphery perpendicular pinnacle piquancy pitch poignancy point pointedness pole prickliness prickly pungency purfle purl radius radius vector ragged edge razor-edge reset restive restless ridge right line rigor rim roughness running start secant segment selvage send-off sensitive set set off setting in motion setting-up seventh heaven severity sharp sharpen sharpness shore shortcut shrillness side sideline sideslip sidestep sidle skew skid skirt sky something extra something in reserve sourness spiculate spinosity spire spur square one start start-off starting point steal sting straight straight course straight line straight stretch straightaway strap streamline stridency stringency strop summit superiority surround take-off tangent taper tartness teeth tense