noun Photography.
an early type of photograph, made by placing a glass negative against a dark background.

1850–55, Americanism; < Greek ámbro(tos) immortal (see ambrosia) + -type Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ambrotype (ˈæmbrəʊˌtaɪp)
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 & Unabridged 10th Edition
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Word Origin & History

1855, Amer.Eng., perhaps from amber, with reference to its property of preserving life forms or its color, or from Gk. ambrotos "immortal, imperishable" (see ambrosia). A type of photograph on glass with lights given by silver and shades by a dark background showing through.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The ambrotype was less expensive to make than a daguerreotype.
Original photograph: an ambrotype now known through copy prints.
Images for ambrotype
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