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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 penumbrae
 penumbra的複數形

From: WordNet (r) 2.0

 penumbra
      n : a fringe region of partial shadow around an umbra
      [also: penumbrae (pl)]

From: WordNet (r) 2.0

 penumbrae
      See penumbra