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penumbra

US [pəˈnʌmbrə]
UK [pə'nʌmbrə]
  • n.(黑暗与光明之间的)半影;(偏食期间的)半影
  • Web半阴影;半影区;半暗带
Plural Form:penumbrae  Plural Form:penumbras  
Penumbra
n.
1.
(黑暗与光明之间的)半影an area of shadow which is between fully dark and fully light
2.
(偏食期间的)半影the shadow made by the earth or the moon during a partial eclipse

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