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An early type of photograph made by imaging a negative on glass backed by a dark surface.
[Greek ambrotos, immortal; see ambrosia + type.]
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.
(Photography) photog an early type of glass negative that could be made to appear as a positive by backing it with black varnish or paper
[C19: from Greek ambrotos immortal + -type; see ambrosia]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
an early type of photograph, made by placing a glass negative against a dark background.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.