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Webster's Dictionary (1865)

Sub-strā'tum, n.

noun

pl. SUB-STRĀ'TĀ. [Lat. substratus, p. p. of substernere, to strew under, from prefix sub, under, and sternere, to strew.]

  1. That which is laid or spread under; a layer of earth lying under another.
  2. (Agric.) The subsoil.
  3. (Metaph.) The permanent subject of qualities or cause of phenomena; substance.