ultra-diffuse

Fetched 2026-10-26 (cache).

Datamuse reports no synonyms or antonyms for this word.

Adjective

1. Extremely [[diffuse]].
2. {{lb|en|astronomy}} Specifically, designating a type of [[galaxy]] with a very low proportion of visible [[star]]s compared to the [[Milky Way]], and hence a very low [[luminosity]].

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.