ultrablack

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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.

Scrabble 18
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Meanings

nounultrablack (plural ultrablacks)

plural ultrablacks · alternative ultra-black · alternative ultra black

  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.
adjectiveultrablack (comparative more ultrablack, superlative most ultrablack)

comparative more ultrablack · superlative most ultrablack · alternative ultra-black · alternative ultra black

  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.

Origin

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

Full word history & related roots →
Cite this entry
APA

ultrablack. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/ultrablack

MLA

“ultrablack.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/ultrablack. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “ultrablack,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/ultrablack.

Source: ultrablack on Wiktionary, CC BY-SA 4.0.