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18.116.14.48
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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Grit·rock Grit·stone n. Geol. See Grit, n., 4.
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From: WordNet (r) 2.0

 gritstone
      n : a hard coarse-grained siliceous sandstone [syn: grit, gritrock]