Word.ws English Dictionary

ultra-diffuse

ultra-diffuse adjective: extremely diffuse.

Adjective

ultra-diffuse (comparative more ultra-diffuse, superlative most ultra-diffuse)

  1. Extremely diffuse.
  2. Specifically, designating a type of galaxy with a very low proportion of visible stars compared to the Milky Way, and hence a very low luminosity.
    • In the next sections we study the properties of galaxies that satisfy our criteria to be ultra diffuse, and consider the contribution from galaxies in the fore- and background using the CFHTLS fields.2016, Van der Burg, Muzzin & Hoekstra, ‘The abundance and spatial distribution of ultra-diffuse galaxies in nearby galaxy clusters’, Astronomy & Astrophysics
    • The galaxy, called NGC1052-DF2, is about 65 million light years away. It is almost as big as the Milky Way but is “ultra-diffuse,” meaning it contains just a vanishing fraction of the stars found in our galaxy—only 1 percent, in this case.2018 March 28, Rebecca Boyle, Scientific American

Forms of ultra-diffuse

comparativemore ultra-diffuse
superlativemost ultra-diffuse
alternative formultra diffuse

Words formed from ultra-diffuse

Questions about ultra-diffuse

What does ultra-diffuse mean?
Ultra-diffuse means extremely diffuse.
What part of speech is ultra-diffuse?
Ultra-diffuse is an adjective.

Words near ultra-diffuse in the dictionary

  1. ultra-
  2. ultra-conservative
  3. ultra-darwinism
  4. ultra-darwinist
  5. ultra-darwinists
  6. ultra-diffuse
  7. ultra-empirical
  8. ultra-excessive
  9. ultra-fast
  10. ultra-fast fashion
  11. ultra-high

Source and license

Adapted from Wiktionary: ultra-diffuse (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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