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umbral

/uhm-bruhl/US // ˈʌm brəl //

伞状,伞状物,伞状的,伞状结构

Related Words

Definitions

adj.形容词 adjective
  1. 1
    • : 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. 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. 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.

Synonyms & Antonyms

Examples

  • Outside the umbral cone is that of the penumbra, within which the sun is partially hidden by the moon.

  • Rosario entraba una llave en la invisible cerradura, y abra cuidadosamente la 115 puerta en cuyo umbral se haban sentado.