Usually means: Clay layer beneath coal seams.
Definitions Related words Mentions History
We found 13 dictionaries that define the word Underclay:

General (11 matching dictionaries)
  1. underclay: Merriam-Webster
  2. underclay: Collins English Dictionary
  3. underclay: Wiktionary
  4. underclay: Webster's New World College Dictionary, 4th Ed.
  5. Underclay, underclay: Dictionary.com
  6. Underclay: Online Plain Text English Dictionary
  7. underclay: Webster's Revised Unabridged, 1913 Edition
  8. Underclay: AllWords.com Multi-Lingual Dictionary
  9. underclay: FreeDictionary.org
  10. underclay: TheFreeDictionary.com
  11. underclay: Wordnik

Computing (1 matching dictionary)
  1. underclay: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

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Definitions from Wiktionary (underclay)

▸ noun:  (geology) A stratum of clay lying beneath a coal bed.

Similar:
clump, claypan, coal seam, day coal, clarain, china clay, urry, brickclay, claystone, claye, more...

Opposite:
overburden, overlying rock, overlying strata

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Similar:
clump, claypan, coal seam, day coal, clarain, china clay, urry, brickclay, claystone, claye, more...

Opposite:
overburden, overlying rock, overlying strata



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