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rotorcraft
Rotorua
rototill
rototiller
rotovate
Rotovator
rotten
rotten borough
rottenstone
rotter
Rotterdam
rottweiler
rotund
rotunda
ROU
Roubaix
roué
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rottenstone
rot·ten·stone [ rótt'n stn ]


noun 
Definition:
 
silica-rich limestone: a form of silica-rich limestone that has been decomposed by weathering and is used in powdered form for polishing metal
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