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artificial horizon

noun
1.
a level, as a surface of mercury, used in determining the altitudes of stars.
Compare level (def 35).
2.
the bubble in a sextant or octant for aerial use.
3.
Also called flight indicator, gyro horizon. Aeronautics. an instrument that indicates the banking and pitch of an aircraft with respect to the horizon.
Origin
1795-1805
1795-1805
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for artificial horizon

artificial horizon

noun
1.
Also called gyro horizon. an aircraft instrument, using a gyroscope, that indicates the aircraft's attitude in relation to the horizontal
2.
(astronomy) a level reflecting surface, such as one of mercury, that measures the altitude of a celestial body as half the angle between the body and its reflection
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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