substratum

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Related to Linguistic substratum: superstratum, Superstrate, Adstratum, Substrate language

sub·stra·tum

(sŭb-strā'tŭm),
Any layer or stratum lying beneath another.
[L. see substrate]
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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
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