# glucose

/ˈɡɫuˌkoʊs/ (US) · /ɡlˈuːkəʊs/ (UK) · CEFR B2 · Noun

Source: https://englishreference.com/word/glucose
Updated: 2026-05-02

## Definition

a simple type of sugar that gives your body and brain energy. It is found in many foods and travels through your blood to reach your cells.

For teachers: a simple sugar that acts as an essential energy source in living organisms and is a component of many carbohydrates. It is a monosaccharide and a primary metabolic intermediate in cellular respiration.

## Examples

- The body converts carbohydrates into glucose for energy.
- Athletes often consume drinks high in glucose to maintain their energy levels during long races.
- Maintaining stable glucose levels in the bloodstream is critical for cognitive function, as the brain relies almost exclusively on this sugar for its metabolic requirements.

## Usage notes

- Uncountable when referring to the chemical substance; can be countable in medical contexts when referring to specific test results or types.

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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.