2 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Substratum \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.
From WordNet r 1.6 [wn]:
substratum
n : any stratum lying underneath another [syn: {substrate}]
more about substratum
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