penumbra
美音:[pı´nʌmbrə
]
英音:[pı´nʌmbrə
]
n.(日蚀、月蚀或太阳黑子的)半影
难易程度:
penumbra为短语/超纲词汇
词形变化:
形容词:penumbral 名词复数:penumbrae
词根
umbr＝shadow（阴影）
近义词, 同义词
penumbra
/pɪ'nʌmbrə; pɪ`nʌmbrə/
n (pl -brae / -bri:; -bri/ or -bras / -brEz; -brEz/) partly shaded area around the shadow of an opaque object (esp around the total shadow of the moon or earth in an eclipse) 半阴影; （尤指日、月蚀的）半影. Cf 参看 umbra.
n (pl -brae / -bri:; -bri/ or -bras / -brEz; -brEz/) partly shaded area around the shadow of an opaque object (esp around the total shadow of the moon or earth in an eclipse) 半阴影; （尤指日、月蚀的）半影. Cf 参看 umbra.
penumbra
n[C]
[Date: 1600-1700; Language: Modern Latin;Origin:Latin paene 'almost' + umbra 'shadow']
technical an area of slight darkness
[Date: 1600-1700; Language: Modern Latin;Origin:Latin paene 'almost' + umbra 'shadow']
technical an area of slight darkness
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