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That which is laid or spread under; that which underlies something, as a layer of earth lying under another; specifically (Agric.), the subsoil.

mbrane (Anat.), a delicate membrane composed of a single layer of flat cells, forming the substratum upon which, in many organs, the epithelioid cells are disposed.

The hard substratum. Same as Hard pan, under Hard, a.

To dig away, or otherwise remove, the substratum or foundation of; to lay a mine under; to sap; to undermine; hence, to ruin or destroy by slow degrees or secret means. They mined the walls. Hayward. Too lazy to cut down these immense trees, the spoilers... had mined them, and placed a quantity of gunpowder in the cavi…

A broad embankment of earth round a place, upon which the parapet is raised. It forms the substratum of every permanent fortification. Mahan.

An imitation of any veined and ornamental stone, as marble, formed by a substratum of finely ground gypsum mixed with glue, the surface of which, while soft, is variegated with splinters of marble, spar, granite, etc., and subsequently colored and polished.

n, whether spiritual or material, inheres, or to which any of these appertain; substance; substratum. That which manifests its qualities -- in other words, that in which the appearing causes inhere, that to which they belong -- is called their subject or substance, or substratum. Sir W. Hamilton.

That which underlies all outward manifestations; substratum; the permanent subject or cause of phenomena, whether material or spiritual; that in which properties inhere; that which is real, in distinction from that which is apparent; the abiding part of any existence, in distinction from any accident; that which consti…

A substratum. [R.]