Gritstone

noun

Definitions

Noun
  1. 1
    A form of sedimentary rock, similar to sandstone but coarser. countable, uncountable

    "So Tom went to go down; and first he went down three hundred feet of steep heather, mixed up with loose brown grindstone, as rough as a file […]"

  2. 2
    a hard coarse-grained siliceous sandstone wordnet

Etymology

From grit + stone.

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