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A photoelectric instrument for ascertaining cloud heights.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Physical Geography) a device for determining the cloud ceiling, esp by means of a reflected light beam
[C20: from ceiling + -meter]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ceil•om•e•ter(siˈlɒm ɪ tər, sɪ-)
an automatic device for measuring and recording the height of clouds by triangulation.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
an instrument for measuring by triangulation and recording the distance between the earth and the cloud ceiling.See also: Clouds
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.