# RNA

/ˌɑˌɹɛˈneɪ/ (US) · CEFR C1 · Noun

Source: https://englishreference.com/word/rna
Updated: 2026-05-10

## Definition

Stands for ribonucleic acid. A molecule in your cells that carries instructions from your DNA to help build proteins. It acts like a messenger that tells the cell how to grow and function.

For teachers: Abbreviation for ribonucleic acid. A nucleic acid present in all living cells that acts as a messenger carrying instructions from DNA for controlling the synthesis of proteins. In some viruses, it serves as the primary carrier of genetic information.

## Examples

- The vaccine uses a small piece of RNA to teach the body.
- Scientists studied how the virus uses its own RNA to hijack the host cell's machinery and replicate itself.
- Messenger RNA plays a critical role in gene expression by translating the genetic code stored in the nucleus into functional proteins within the cytoplasm.

## Usage notes

- Usually uncountable when referring to the substance; can be countable when referring to specific types (e.g., 'different RNAs').

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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.