Standard Lemma guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
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adj
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.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
adj
Used other than figuratively or idiomatically: see ultra-, black.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
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.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
Used other than figuratively or idiomatically: see ultra, black.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
ultra- + black. By surface analysis, ultra + black.
