| 单词 | penumbra |
| 释义 | Word Frequency penumbra(pɪˈnʌmbrə) nounWord forms: plural -brae (-briː) or -bras Compare umbra 1. a fringe region of half shadow resulting from the partial obstruction of light by an opaque object 2. astronomy the lighter and outer region of a sunspot 3. painting the point or area in which light and shade blend Derived forms penumbral (peˈnumbral) or penumbrous (peˈnumbrous) adjective Word origin C17: via New Latin from Latin paene almost + umbra shadow |
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