Aurora



GRE TOEFL

解释

GRE 红宝书

Aurora

• n.极光 ( 南北极夜晚所放彩光)
• ［同］ 派生词: auroral adj.极光的

Webster Collegiate

noun (plural auroras or aurorae)

• Etymology: Latin — more at east
• Date: 14th century
• 1. dawn
• 2. capitalized the Roman goddess of dawn — compare Eos
• 3. a luminous phenomenon that consists of streamers or arches of light appearing in the upper atmosphere of a planet's magnetic polar regions and is caused by the emission of light from atoms excited by electrons accelerated along the planet's magnetic field lines
• • auroral adjective
• • aurorean adjective

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