# substrate

/ˈsəbˌstɹeɪt/ (US) · /sˈʌbstɹeɪt/ (UK)

Source: https://englishreference.com/word/substrate
Updated: 2026-06-20

## Senses

### 1. biological surface

noun · CEFR C1 · Technical

the surface or material that a plant or animal lives and grows on.

For teachers: the surface or medium on which an organism grows or is attached.

- The coral larvae need a hard substrate like rock to attach themselves to.
- In the intertidal zone, the type of substrate—whether sandy, muddy, or rocky—determines which species of invertebrates can successfully colonise the area.

### 2. chemical reactant

noun · CEFR C1 · Technical

a substance that an enzyme acts on to cause a chemical reaction.

For teachers: the specific compound or molecule upon which an enzyme acts to produce a chemical change.

- The enzyme breaks down the substrate into smaller pieces of sugar.
- The lock-and-key model describes how the enzyme's active site is shaped specifically to fit its corresponding substrate.

### 3. underlying layer

noun · CEFR C1 · Technical

a bottom layer or base that supports something else on top of it.

For teachers: an underlying substance or layer; a substratum providing the foundation for another material.

- The silicon substrate is the base for all the tiny parts in a computer chip.
- Before applying the final decorative coating, the technician ensured the metal substrate was free of any oxidation or debris.

### 4. linguistic influence

noun · CEFR C2 · Academic · Technical

a language that was spoken in an area before a new one took over and influenced it.

For teachers: a language of lower prestige which influences a dominant language that has replaced it in a population.

- The local language acted as a substrate, changing how the new settlers spoke.
- Linguists argue that the Celtic substrate significantly influenced the phonology and syntax of the English spoken in those specific regions.

## Examples

- The bacteria grow quickly on this nutrient-rich substrate.
- The artist prepared the wooden substrate with a layer of primer before applying the oil paints.
- In marine biology, the composition of the rocky substrate determines which species of coral and anemone can successfully colonize the reef floor.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.