the GNU version of the Collaborative International Dictionary of English
n. That which is laid or spread under; that which underlies something, as a layer of earth lying under another; specifically (Agric.), the subsoil.
n. The permanent subject of qualities or cause of phenomena; substance.
The Century Dictionary and Cyclopedia
n. That which is laid or spread under; a stratum lying under another; in agriculture, the subsoil; hence, anything which underlies or supports: as, a substratum of truth.
n. In metaphysics, substance, or matter, as that in which qualities inhere.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a surface on which an organism grows or is attached
n. an indigenous language that contributes features to the language of an invading people who impose their language on the indigenous population
n. any stratum or layer lying underneath another
Word Usage
"If we take away the useful labour expended upon them, a material substratum is always left, which is furnished by Nature without the help of man."