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Merriam-Webster's Collegiate Dictionary equa·tor ETYMOLOGY Middle English, from Medieval Latin aequator,literally, equalizer, from Latin aequare DATE 14th century 1. the great circle of the celestial sphere whose plane is perpendicular to the axis of the earth 2. a great circle of the earth or a celestial body that is everywhere equally distant from the two poles and divides the surface into the northern and southern hemispheres 3. a. a circle or circular band dividing the surface of a body into two usually equal and symmetrical parts b. equatorial plane the equator of a dividing cell 4. great circle English Etymology equator c.1391, from M.L. æquator diei et noctis "equalizer of day and night" (when the sun is on the celestial equator, twice annually, day and night are of equal length), from L. æquare "make equal, equate." Sense of "celestial equator" is earliest, extension to "terrestrial line midway between the poles" first recorded in Eng.1612. Oxford Advanced Learner's Dictionary-牛津双解-OALD7 equator equa·tor / i5kweitE(r) / (usually the equator)noun[sing.] an imaginary line around the earth at an equal distance from the North and South Poles 赤道 Oxford Collocations Dictionary for Students of English equator noun VERB + EQUATOR cross PREP. around the ~ Rainforests occur around the equator. | at the ~ The sun heats the sea more at the equator than at the poles. | close to/near the ~ in an area near the equator | on the ~ The lake lies exactly on the equator. PHRASES north/south of the equator The island is just 80 miles north of the equator. Webster's Third New International Dictionary, Unabridged Search result show the entry is found in: magnetic equator , or terrestrial equator , or thermal equator , or celestial equator , or equator coordinate , or equator of heat , or equator system of coordinates , or galactic equator , or geomagnetic equator , or heat equator equa·tor \ēˈkwād.ə(r), ə̇ˈk- also ˈēˌk-\ noun (-s) Etymology: Middle English, from Medieval Latin aequator, from Latin aequatus (past participle of aequare to make equal) + -or — more at equable 1. : the great circle of the celestial sphere whose plane is perpendicular to the axis of the earth : celestial equator 2. : the great circle midway between the poles of rotation of a planet, star, or other celestial body; specifically : a great circle of the earth that is everywhere equally distant from the two poles and divides the earth's surface into the northern and southern hemispheres and that is the line from which latitudes are reckoned, its own latitude being everywhere 0 degrees — see zone illustration3. : a circle or circular band dividing the surface of a body into two usually equal and symmetrical parts < the rainfall equator > especially : a circle about a body at the place of its greatest width < equator of a balloon > < equator of an egg > < equator of the eyeball > 4. : the circle on a surface of revolution that bisects its meridians; specifically : great circle |
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