Webster's English Dictionary

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equatorial

1. equa.to.ri.al \.e--kw*-'to-r-e--*l, .ek-w*-, -'to.r-\ aj 1a: of, located 
   at, or relating to the equator or an equator  1b: of, originating in, or 
   suggesting the region around the geographic equ ator 2: being or having a 
   support that includes two axles at right angles to ea ch other with one 
   parallel to the earth's axis of rotation
2. equatorial n : an equatorial telescope