单词	octant
释义	octant noun oc·​tant ˈäk-tənt  1 : an instrument for observing altitudes of a celestial body from a moving ship or aircraft 2 : any of the eight parts into which a space is divided by three coordinate planes Example Sentences Recent Examples on the Web There is no way for such a locus to exist only in opposing octants of a cube. Quanta Magazine, 29 June 2018 Word History Etymology Latin octant-, octans eighth of a circle, from octo First Known Use 1672, in the meaning defined at sense 1
随便看	petrocurrencies petrodollar petrodollars petrodvorets petrofabric petrofabric diagram petrofabrics petrogale petrogales petrogeneses petrogenesis petrogenetic petrogenic petrogeny petroglyph Petroglyph National Monument petroglyphic petroglyphs petroglyphy petrograd petrogrades petrograds petrograph petrographer petrographers

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