Substratum is the underlying layer, especially of rock or soil below the ground.
When you start to dig for a patio and you hit a layer of hard rock just below the ground, this layer of rock is an example of a substratum.
pl. -·ta or -·tums
- a part, substance, element, etc. which lies beneath and supports another; foundation
- any basis or foundation
- substrate (senses & )
- loosely subsoil
- Bot. the base or material to which a plant is attached and from which it gets nutriment
- Philos. substance (sense )
- Photog. a thin layer of material on a photographic film or plate serving as a base for the sensitive emulsion
- Zool. the ground or other solid material on which an animal moves or is fastened
Origin of substratumModern Latin ; from L, neuter of substratus, past participle of substernere, to strew beneath ; from sub-, under + sternere, to spread out ; from Indo-European base an unverified form ster- from source strew
nounpl. sub·stra·ta or sub·stra·tums
- a. An underlying layer.b. 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.
Origin of substratumNew Latin substratum, from neuter of Latin substratus, past participle of substernere, to lay under : sub-, sub- + sternere, to stretch, spread; see ster-2 in Indo-European roots.