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单词 penumbral
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WordReference Random House Unabridged Dictionary of American English © 2024
pe•num•bra  (pi numbrə),USA pronunciation n., pl. -brae (-brē),USA pronunciation -bras. 
  1. Astronomy
    • the partial or imperfect shadow outside the complete shadow of an opaque body, as a planet, where the light from the source of illumination is only partly cut off. Cf. umbra (def. 3a).
    • the grayish marginal portion of a sunspot. Cf. umbra (def. 3b).
  2. a shadowy, indefinite, or marginal area.
  • Neo-Latin, equivalent. to Latin paen- pen- + umbra shade
  • 1660–70
pe•numbral, pe•numbrous, adj. 

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