01 n. That which is laid or spread under; that which underlies something, as a layer of earth lying under another; specifically (Agric.), the subsoil.
pl.
Substrata ((#))
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1.
That which is laid or spread under; that which underlies something, as a layer of earth lying under another; specifically (Agric.), the subsoil.(Agric.)
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2.
The permanent subject of qualities or cause of phenomena; substance.(Metaph.)