Sub*stra"tum (?), n.; pl. Substrata (#). [L. substratus, p.p. of substernere to strew under; sub under + sternere to strew. See Stratum.]

1.

That which is laid or spread under; that which underlies something, as a layer of earth lying under another; specifically Agric., the subsoil.

2. Metaph.

The permanent subject of qualities or cause of phenomena; substance.

 

© Webster 1913.

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