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

pe•num•bra n., pl. -brae -bras.

Astronomy
- the partial or imperfect shadow outside the complete shadow of an opaque body, as a planet, where the light from the source of illumination is only partly cut off. Cf. umbra (def. 3a).
- the grayish marginal portion of a sunspot. Cf. umbra (def. 3b).
a shadowy, indefinite, or marginal area.

pe•num′bral, pe•num′brous, adj.

单词	penumbral
释义	WordReference Random House Unabridged Dictionary of American English © 2024 pe•num•bra (pi num′brə),USA pronunciation n., pl. -brae (-brē),USA pronunciation -bras. Astronomy the partial or imperfect shadow outside the complete shadow of an opaque body, as a planet, where the light from the source of illumination is only partly cut off. Cf. umbra (def. 3a). the grayish marginal portion of a sunspot. Cf. umbra (def. 3b). a shadowy, indefinite, or marginal area. Neo-Latin, equivalent. to Latin paen- pen- + umbra shade 1660–70 pe•num′bral, pe•num′brous, adj.
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