Found 2 items, similar to substratum.
English → English (WordNet) Definition: substratum substratum n : any stratum lying underneath another [syn: substrate] [also: substrasta (pl)]
English → English (gcide) Definition: Substratum 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. [1913 Webster] 2. (Metaph.) The permanent subject of qualities or cause of phenomena; substance. [1913 Webster]