substrate

[suhb-streyt]
noun
1.
a substratum.
2.
Biochemistry. the substance acted upon by an enzyme.
3.
Electronics. a supporting material on which a circuit is formed or fabricated.

Origin:
1570–80; variant of substratum

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World English Dictionary
substrate (ˈsʌbstreɪt)
 
n
1.  biochem the substance upon which an enzyme acts
2.  another word for substratum
3.  electronics the semiconductor base on which other material is deposited, esp in the construction of integrated circuits

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

substrate sub·strate (sŭb'strāt')
n.

  1. The material or substance on which an enzyme acts.

  2. A surface on which an organism grows or is attached.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
substrate   (sŭb'strāt')  Pronunciation Key 
  1. The material or substance on which an enzyme acts. See more at enzyme.

  2. The surface on or in which plants, algae, or certain animals, such as barnacles or clams, live or grow. A substrate may serve as a source of food for an organism or simply provide support.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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FOLDOC
Computing Dictionary

substrate definition

hardware
The body or base layer of an integrated circuit, onto which other layers are deposited to form the circuit. The substrate is usually Silicon, though Sapphire is used for certain applications, particularly military, where radiation resistance is important. The substrate is originally part of the wafer from which the die is cut. It is used as the electrical ground for the circuit.
(1996-04-07)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Scientists have described this type of forest as a nutrient-rich economy
  perched on a nutrient-poor substrate.
The substrate to which the inverter is to be fitted must be sturdy and
  noncombustible.
Evidence of repeated, prolonged touching had worn away both paint and actual
  decoration, at some places down to the substrate.
It can also be applied to a wooden surface provided that building felt and wire
  mesh are mounted to the substrate beforehand.
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