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  1. Oxford American Dictionary

    Arctic Circle

    • IPA[ˈɑrktɪk ˌsərkəl]

    美式

    • ph.
      the parallel of latitude 66° 33ʹ north of the equator. It marks the northernmost point at which the sun is visible on the northern winter solstice and the southernmost point at which the midnight sun can be seen on the northern summer solstice.