n. An abrasive wheel for sharpening, polishing or grinding.
the GNU version of the Collaborative International Dictionary of English
n. A flat, circular stone, revolving on an axle, for grinding or sharpening tools, or shaping or smoothing objects.
The Century Dictionary and Cyclopedia
n. 1. A stone used in grinding corn; a millstone.
n. A mill for grinding corn.
n. A solid wheel of stone mounted on a spindle and turned by a winch-handle, by a treadle, or by machinery, used for grinding, sharpening, or polishing.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a revolving stone shaped like a disk; used to grind or sharpen or polish edge tools
Word Usage
"ChangeWave keeps its nose to a shorter-term grindstone -- he called the category's ability to grow in the face of a serious economic downturn "astounding.""