| 单词 | penumbra |
| 释义 | penumbra n. (pl. penumbrae or penumbras) 1. a the partly shaded region around the shadow of an opaque body, esp. that around the total shadow of the moon or earth in an eclipse. b the less dark outer part of a sunspot. 2. a partial shadow. Derivatives penumbral adj. Etymology: mod.L f. L paene almost + UMBRA shadow |
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