Word.ws English Dictionary

ultrablack

ultrablack noun: a substance that emits (reflects) less than 0.5% of the light incident upon it, in the specified spectral range; in the visible light spectrum.

Noun

ultrablack (plural ultrablacks)

  1. A substance that emits (reflects) less than 0.5% of the light incident upon it, in the specified spectral range; in the visible light spectrum.
  2. Used other than figuratively or idiomatically: see ultra, black.

Adjective

ultrablack (comparative more ultrablack, superlative most ultrablack)

  1. Having the property of disappearing (not returning) more than 99.5% of the light incident upon it, in the specified spectral range; in the visible light spectrum.
  2. Used other than figuratively or idiomatically: see ultra-, black.

Forms of ultrablack

Noun
pluralultrablacks
alternative formultra-black
alternative formultra black
Adjective
comparativemore ultrablack
superlativemost ultrablack

Origin of ultrablack

ultra- + black. By surface analysis, ultra + black.

Questions about ultrablack

What does ultrablack mean?
Ultrablack means a substance that emits (reflects) less than 0.5% of the light incident upon it, in the specified spectral range; in the visible light spectrum.
What part of speech is ultrablack?
Ultrablack can be a noun or an adjective.
What is the plural of ultrablack?
The plural of ultrablack is ultrablacks.

Words near ultrablack in the dictionary

  1. ultrabasic
  2. ultrabasics
  3. ultrabenevolent
  4. ultrabiomicroscopy
  5. ultrabithorax
  6. ultrablack
  7. ultrablond
  8. ultrabold
  9. ultrabook
  10. ultrabooks
  11. ultrabrachycephalic

Source and license

Adapted from Wiktionary: ultrablack (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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Cite this entry: “ultrablack.” Word.ws, https://word.ws/ultrablack. Based on Wiktionary, CC BY-SA 4.0.