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artificial horizon

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noun
  1. a level, as a surface of mercury, used in determining the altitudes of stars.
  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.
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Origin of artificial horizon

First recorded in 1795–1805
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
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
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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