substratum
subst·ra·tum
noun
1.
any stratum lying underneath another
Origin
Learned borrowing from New Latin substrātum, nominalisation of the neuter of Latin substrātus, perfect passive participle of substernō. By surface analysis, sub- + stratum.
Related words
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.