| 单词 | umbra |
| 释义 | Word Frequency umbra(ˈʌmbrə) nounWord forms: plural -brae (-briː) or -bras Compare penumbra 1. a region of complete shadow resulting from the total obstruction of light by an opaque object, esp the shadow cast by the moon onto the earth during a solar eclipse 2. the darker inner region of a sunspot Derived forms umbral (ˈumbral) adjective Word origin C16: from Latin: shade, shadow |
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