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penumbra 音標拼音: [pɪn'ʌmbrə] n. 半影 半影 penumbra n 1: a fringe region of partial shadow around an umbra Penumbra \Pe*num"bra\, n. [NL., fr. L. paene almost umbra
shade.] 1. An incomplete or partial shadow. [1913 Webster] 2. (Astron.) The shadow cast, in an eclipse, where the light is partly, but not wholly, cut off by the intervening body; the space of partial illumination between the umbra, or perfect shadow, on all sides, and the full light. --Sir I. Newton. [1913 Webster] Note: The faint shade surrounding the dark central portion of a solar spot is also called the {penumbra}, and sometimes {umbra}. [1913 Webster] 3. (Paint.) The part of a picture where the shade imperceptibly blends with the light. [1913 Webster]
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