英语词汇“umbral”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

um•bra n., pl. -bras, -brae

shade;
shadow.
the invariable or characteristic accompaniment or companion of a person or thing.
[Astron.]
- 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).
- the dark central portion of a sunspot. Cf. penumbra (def. 1b).
a phantom or shadowy apparition, as of someone or something not physically present;
ghost;
spectral image.

um′bral, adj.

单词	umbral
释义	WordReference Random House Unabridged Dictionary of American English © 2024 um•bra (um′brə),USA pronunciation n., pl. -bras, -brae (-brē).USA pronunciation shade; shadow. the invariable or characteristic accompaniment or companion of a person or thing. [Astron.] 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). the dark central portion of a sunspot. Cf. penumbra (def. 1b). a phantom or shadowy apparition, as of someone or something not physically present; ghost; spectral image. Latin: shade, shadow 1590–1600 um′bral, adj.
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