substrate solid (usually planar) substance onto which a layer of another substance is applied, and to which that second substance adheres; (in solid-state electronics) thin slice of material. These serve as the foundation upon which electronic devices

substrate material existing or extracted from beneath the topsoil, including sand, chalk and clay; materials used in building foundations or else incorporated into plaster, brick, ceramic and concrete components, which are sometimes called 'filler' products

substrate geology

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