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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

substrate

, substratum (sub'strat) (sub-stra'tum) [L. substratum, to lie under]
1. An underlying layer or foundation.
2. A base, as of a pigment.
3. The substance acted upon, as by an enzyme. See: enzyme
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
Mr Wigley reminds us of the Tories' regional powers sub-stratum.
One hears so much about a sub-stratum of mostly young people whose culture is so impoverished that drink, drugs, pop music, football and teenage sex dominate their lives.
Compare this to the case of Levi de Barrios, who, posing as a Christian, wrote comedias for a patron in Brussels while also trying to establish himself in Amsterdam's Jewish community by writing morality plays that nevertheless, as Litovsky reveals, contain a sub-stratum of Christian assumptions.