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galactic

adjective
🔊/ɡəˈlæktɪk/
🔊/ɡəˈlæktɪk/
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  1. relating to a galaxy银河的；星系的
    • A galactic year is the time the galaxy takes to rotate once completely.银河年是银河系完全旋转一次的时间。
    Word Originmid 19th cent.: from Greek galaktias (variant of galaxias ‘galaxy’) + -ic.