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equatorial

[ee-kwuh-tawr-ee-uh l, -tohr-, ek-wuh-]
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adjective
  1. of, relating to, or near an equator, especially the equator of the earth.
  2. of, like, or typical of the regions at the earth's equator: equatorial temperatures.
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noun
  1. a telescope mounting having two axes of motion, one parallel to the earth's axis and one at right angles to it.
  2. a telescope with such a mounting.
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Origin of equatorial

First recorded in 1655–65; equator + -ial
Related formse·qua·to·ri·al·ly, adverbnon·e·qua·to·ri·al, adjectivenon·e·qua·to·ri·al·ly, adverbtrans·e·qua·to·ri·al, adjectivetrans·e·qua·to·ri·al·ly, adverbun·e·qua·to·ri·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for equatorial

equatorial

adjective
  1. of, like, or existing at or near the equator
  2. astronautics (of a telescope) mounted on the perpendicular axes, one of which is parallel to the earth's axisan equatorial orbit
  3. astronomy of or referring to the celestial equatorequatorial coordinates
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noun
  1. an equatorial mounting for a telescope
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Derived Formsequatorially, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for equatorial

adj.

1660s, from equator + -al (1).

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Online Etymology Dictionary, © 2010 Douglas Harper