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.
nounpl. -·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 substrātum from neuter of Latin substrātus past participle of substernere to lay under sub- sub- sternere to stretch, spread ; see ster-2 in Indo-European roots.