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vertical circle

noun, Astronomy
1.
a great circle on the celestial sphere passing through the zenith.
Origin
1550-1560
1550-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for vertical-circle

vertical circle

noun
1.
(astronomy) a great circle on the celestial sphere passing through the zenith and perpendicular to the horizon
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
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vertical-circle in Science
vertical circle  
A great circle on the celestial sphere that passes through the zenith and the nadir and thus is perpendicular to the horizon.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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13
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