noun Astronomy.
an instrument for determining both the altitude and the azimuth of a heavenly body.

1855–60; alt(itude) + azimuth Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
altazimuth (ælˈtæzɪməθ)
an instrument for measuring the altitude and azimuth of a celestial body by the horizontal and vertical rotation of a telescope
[C19: from alt(itude) + azimuth]

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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Example sentences
Adjustable tripod and altazimuth mount with micro-adjusting controls make it exceptionally easy to use.
Modern computerized altazimuth telescopes track well, even at high powers.
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