| 单词 | umbra |
| 释义 | umbra —umbral, adj. /um"breuh/, n. , pl. umbras, umbrae /-bree/. 1. shade; shadow. 2. the invariable or characteristic accompaniment or companion of a person or thing. 3. Astron. a. the complete or perfect shadow of an opaque body, as a planet, where the direct light from the source of illumination is completely cut off. Cf. penumbra (def. 1a). b. the dark central portion of a sunspot. Cf. penumbra (def. 1b). 4. a phantom or shadowy apparition, as of someone or something not physically present; ghost; spectral image. [1590-1600; < L: shade, shadow] |
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