[suhb-strey-tuh
m, -strat-uhm, suhb-strey-tuhm, -strat-uhm] 
[-strey-tuh, -strat-uh, -strey-tuh, -strat-uh] , -stra⋅tums. | 1. | something that is spread or laid under something else; a stratum or layer lying under another. |
| 2. | something that underlies or serves as a basis or foundation. |
| 3. | Agriculture. the subsoil. |
| 4. | Biology. the base or material on which a nonmotile organism lives or grows. |
| 5. | Philosophy. substance, considered as that which supports accidents or attributes. |
| 6. | Photography. a layer of material placed directly on a film or plate as a foundation for the sensitive emulsion. |
| 7. | Historical Linguistics. a set of features of a language traceable to the influence of an earlier language that it has replaced, esp. among a subjugated population: The French word for 80, quatre-vingts (“four twenties”), may reflect a Celtic substratum. |
| substratum (sŭb'strā'təm, -strāt'əm) Pronunciation Key
Plural substrata or substratums
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