substratum
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sub·stra·tum
(sŭb-strā'tŭm),Any layer or stratum lying beneath another.
[L. see substrate]
Farlex Partner Medical Dictionary © Farlex 2012
substratum
(sŭb′strā′təm, -străt′əm)n. pl. sub·strata (-strā′tə, -străt′ə) or sub·stratums
Biology A substrate.
sub·stra′tive adj.
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