Usually means: Shadowy, relating to a threshold.
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We found 10 dictionaries that define the word umbral:

General (9 matching dictionaries)
  1. umbral: Merriam-Webster
  2. umbral: Oxford Learner's Dictionaries
  3. umbral: Collins English Dictionary
  4. umbral: Wordnik
  5. umbral: Wiktionary
  6. umbral: Dictionary.com
  7. Umbral: Wikipedia, the Free Encyclopedia
  8. umbral: AllWords.com Multi-Lingual Dictionary
  9. umbral: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. umbral: Encyclopedia

(Note: See umbra as well.)

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Definitions from Wiktionary (umbral)

▸ adjective:  Of or relating to an umbra.
▸ adjective:  (mathematics) Of or relating to umbral calculus.

Similar:
penumbral, umbratic, Umbrielian, umbonial, umbonic, umbracular, umbonal, adumbrative, umbilical, uveal, more...

Opposite:
penumbral

Phrases:
Umbral calculus, more...



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Similar:
penumbral, umbratic, Umbrielian, umbonial, umbonic, umbracular, umbonal, adumbrative, umbilical, uveal, more...

Opposite:
penumbral

Phrases:
Umbral calculus, more...



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