substrate

noun

sub·​strate ˈsəb-ˌstrāt 

1

: substratum

2

: the base on which an organism lives

the soil is the substrate of most seed plants

3

: a substance acted upon (as by an enzyme)

Did you know?

With its Latin prefix sub-, "below", substrate obviously refers to a layer under something else. Rock may serve as the substrate for the coral in a coral reef. Tiny wafers of silicon (or another semiconductor) serve as the substrate for computer chips. Substrate may also mean subsoil—that is, the layer under the topsoil, lacking in organic matter or humus. Substrate is part of the vocabulary of various other sciences, including chemistry and biology. But although it's mostly a scientific term, writers may also use it to mean simply "foundation"—for instance, when observing that reading is the substrate on which most other learning is based.

Examples of substrate in a Sentence

Recent Examples on the Web

Whoever's intelligence layer becomes the default substrate shapes what gets built on top of it, everywhere. — Ashish Bhatia, Forbes.com, 4 Aug. 2026

Since the substrate’s atomic spacing differs slightly from that of RuO₂, the ultrathin film is forced to stretch to match it—a condition known as epitaxial strain. — Rupendra Brahambhatt, Interesting Engineering, 2 Aug. 2026

That substrate can only fit about 10,000 logic gates, where a modern 2- or 5-nanometer chip fits billions. — Jackie Snow, IEEE Spectrum, 30 July 2026

What the foot is really good for is gripping things and staying there, vacuum-sealing the ab to a substrate with a force many times its own bodyweight. — Literary Hub, 29 July 2026

Word History

Etymology

Medieval Latin substratum

First Known Use

1730, in the meaning defined at sense 1

Rhymes for substrate

• abate
• airfreight
• await
• baseplate
• berate
• birthdate
• birthrate
• bookplate
• borate
• breastplate
• bromate
• casemate

Kids Definition

substrate

noun

sub·​strate ˈsəb-ˌstrāt 

1

: an underlying layer: as

a

: substratum sense a

b

: the base on which an organism lives or over which it moves

the soil is the substrate of most plants

2

: a substance acted upon (as by an enzyme)

Medical Definition

substrate

noun

sub·​strate ˈsəb-ˌstrāt 

1

: substratum sense 1

2

: the base on which an organism lives

3

: a substance acted upon (as by an enzyme)