Substrata

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This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

Wiktionary, Creative Commons Attribution/Share-Alike License
  • n. Plural form of substratum.
  • Word Usage
    "Moreover, the two very compact mortar layers we found underneath the erosion layers on top and in between several enormous rubble blocks could be identified as the substrata of the original floor level, similar to those of dining Room XXII."
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