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hardground

From Wiktionary, the free dictionary

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English

Etymology

From hard +‎ ground.

Noun

hardground (plural hardgrounds)

English Wikipedia has an article on:
Wikipedia
  1. (geology) A lithified seafloor.
    Ancient hardgrounds are found in limestone sequences and distinguished from later-lithified sediments by evidence of exposure to normal marine waters.
  2. (mining) A hard stratum of rock other than coal.

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