Etymology
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substratum (n.)

1630s, from Modern Latin substratum (plural substrata), noun use of neuter singular past participle of Latin substernere "to spread underneath," from sub "under, below, beneath" (see sub-) + sternere "to spread out, lay down, stretch out," from nasalized form of PIE root *stere- "to spread."

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Definitions of substratum

substratum (n.)
a surface on which an organism grows or is attached;
Synonyms: substrate
substratum (n.)
any stratum or layer lying underneath another;
Synonyms: substrate
substratum (n.)
an indigenous language that contributes features to the language of an invading people who impose their language on the indigenous population;
Synonyms: substrate
From wordnet.princeton.edu