英文字典中文字典51ZiDian.com

The Collaborative International Dictionary of English v.0.48 (gcide)

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]

请选择你想看的字典辞典：

单词	字典	翻译
Penumbra	查看　Penumbra　在百度字典中的解释	百度英翻中〔查看〕
Penumbra	查看　Penumbra　在Google字典中的解释	Google英翻中〔查看〕
Penumbra	查看　Penumbra　在Yahoo字典中的解释	Yahoo英翻中〔查看〕