# nix

/ˈnɪks/ (US) · /nˈɪks/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/nix
Updated: 2026-05-18

## Definition

a small, dark spot on the surface of the Moon. You can see them as dark areas when you look at the Moon through a telescope.

For teachers: a small, dark lunar crater or depression, typically measuring less than 100 meters in diameter. Often used in the plural to describe the fine details of the lunar surface.

## Examples

- The telescope showed several small nix on the Moon's edge.
- Astronomers used high-resolution imaging to map the distribution of nix across the lunar highlands.
- While larger craters are easily visible to the naked eye, the nix require specialized equipment to observe, as they are often obscured by the Moon's rugged terrain and lighting conditions.

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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.