substrate

American  

[suhb-streyt] / ˈsʌb streɪt /

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.

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substrate British  

/ ˈsʌbstreɪt /

noun

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

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substrate Scientific  

/ sŭb′strāt′ /

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

2. See more at enzyme

3. 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.

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Etymology

Origin of substrate

First recorded in 1570–80; variant of substratum

Explanation

A substrate is the base layer of something, or a layer that's underneath another layer. It can also be a surface on which an organism grows or is attached. Substrate also has a linguistic meaning: It's an indigenous language that contributes words or parts of speech to the language of an invading people who have imposed their language on the indigenous people. Throughout the United States, for instance, there are towns with Native American names, because Native American languages form a substrate to American English.

Example Sentences

Major substrate manufacturers have said AI-related production lines are at or near full capacity, and they expect industry capacity to fall well short of demand by 2027.

From The Wall Street Journal • Apr. 10, 2026

The industry’s move to co-packaged optics — where optical transceivers are integrated directly onto the chip substrate to save power — will be an especially big benefit to Lumentum.

From MarketWatch • Mar. 18, 2026

A water system irrigates the plants via a nutrient substrate, a liquid fertiliser that replaces the nutrients and minerals naturally present in the soil.

From Barron's • Feb. 17, 2026

Items in short supply include the ultrathin layers of silicon substrate some chips require and memory chips, the semiconductors that feed data to AI processors and help store the results of computations.

From The Wall Street Journal • Dec. 30, 2025

Time was, a "book" was something produced by many months' labor by a scribe, usually a monk, on some kind of durable and sexy substrate like foetal lambskin.

From Ebooks: Neither E, Nor Books by Doctorow, Cory