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umbral

[ uhm-bruhl ]
/ ˈʌm brəl /
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adjective
of or like a shadow or shadowy apparition:Smoke was rising and beginning to coat the clouds a deep, umbral black.In an instant the vampire’s corporeal form dematerialized into an umbral form that quickly merged with the surrounding cover of night.
Astronomy.
  1. relating to or being the complete shadow of an opaque body, such as a planet, where all direct light from the source of illumination is cut off:It was to be a very deep eclipse, with the moon passing very close to the center of Earth's umbral shadow.Compare penumbral 1a.
  2. relating to or being the dark central portion of a sunspot:Umbral flashes—powerful brightenings that shock the darkest part of the sunspot—appear continuously every 2 to 3 minutes.Compare penumbral 1b.
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Origin of umbral

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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