e·qua·to·ri·al

[ee-kwuh-tawr-ee-uhl, -tohr-, ek-wuh-]
adjective
1.
of, pertaining 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.
noun
3.
a telescope mounting having two axes of motion, one parallel to the earth's axis and one at right angles to it.
4.
a telescope with such a mounting.

Origin:
1655–65; equator + -ial

e·qua·to·ri·al·ly, adverb
non·e·qua·to·ri·al, adjective
non·e·qua·to·ri·al·ly, adverb
trans·e·qua·to·ri·al, adjective
trans·e·qua·to·ri·al·ly, adverb
un·e·qua·to·ri·al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To equatorial
00:10
Equatorial is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
equatorial (ˌɛkwəˈtɔːrɪəl) [Click for IPA pronunciation guide]
 
adj
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 axis: an equatorial orbit
3.  astronomy of or referring to the celestial equator: equatorial coordinates
 
n
4.  an equatorial mounting for a telescope
 
equa'torially
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

equatorial
1713, from equator + -al.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Tropical storms need warm water, moist air, and converging equatorial winds to
  become hurricanes.
They dwell in equatorial rainforests and are characterized by their short mean
  stature.
It tends to be thickest over equatorial regions and thinnest over the poles.
But it revealed many surface streaks, particularly in the equatorial region.
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