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 ?
I thus conclude that, intuitively appealing though Muysken's koineization hypothesis is, a strong case in its favor is yet to be made, and the extant descriptions of possible substrate languages does not allow one to be more confident here.
In addition, the relevant substrate languages, such as Shuar (Jivaroan), are suffixal in nature.