Hypertext Webster Gateway: "Grindstone"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Grindstone \Grind"stone`\, n.
A flat, circular stone, revolving on an axle, for grinding or
sharpening tools, or shaping or smoothing objects.
{To} {hold, pat, or bring} {one's nose to the grindstone}, to
oppress one; to keep one in a condition of servitude.
They might be ashamed, for lack of courage, to
suffer the Laced[ae]monians to hold their noses to
the grindstone. --Sir T.
North.
From WordNet (r) 1.7 (wn)
grindstone
n : a revolving stone shaped like a disk; used to grind or
sharpen or polish edge tools
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