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ellipse

noun
🔊/ɪˈlɪps/
🔊/ɪˈlɪps/
 (specialist)
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  1. a regular oval shape, like a circle that has been pressed on two sides椭圆
    Topics Colours and Shapesc2
    Word Originlate 17th cent.: via French from Latin ellipsis, from Greek elleipsis, from elleipein ‘leave out’.