That which is laid or spread under; that which underlies something, as a layer of earth lying under another; specifically (Agric.), the subsoil.
- An underlying layer.
- A layer of earth beneath the surface soil; subsoil.
- A foundation or groundwork.
- The material on which another material is coated or fabricated.
- Philosophy The characterless substance that supports attributes of reality.
- Biology A substrate.
- Linguistics A substrate.