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Definition:
substratum
substratum
something that is spread or laid under something else; a stratum or layer lying under another
substratum
something that underlies or serves as a basis or foundation
substratum
the subsoil
substratum
that which underlies something, as a layer of earth lying under another also SUBSTRATE
Crossword
a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.