# xenon

/ˈzinɑn/ (US) · /zˈɛnɒn/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/xenon
Updated: 2026-05-19

## Definition

a rare, colorless gas that is used to make bright lights and in car headlights. It is also used in some types of medical equipment.

For teachers: a heavy, colorless, odorless noble gas with the symbol Xe and atomic number 54. It is used in various applications including high-intensity discharge lamps, ion propulsion systems, and medical imaging.

## Examples

- The car uses xenon gas in its headlights.
- Scientists discovered that xenon is present in the atmosphere of several planets in our solar system.
- The spacecraft relies on xenon as a propellant for its ion thrusters, providing a highly efficient means of propulsion for deep-space missions.

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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.