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cyanine

[sahy-uh-neen, -nin] /ˈsaɪ əˌnin, -nɪn/
noun
1.
any of several groups of dyes that make silver halide photographic plates sensitive to a wider color range.
Also, cyanin
[sahy-uh-nin] /ˈsaɪ ə nɪn/ (Show IPA)
.
Origin
1870-1875
1870-75; cyan-1 + -ine2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for cyanine

cyanine

/ˈsaɪəˌniːn/
noun
1.
a blue dye used to extend the sensitivity of photographic emulsions to colours other than blue and ultraviolet
2.
any of a class of chemically related dyes, used for the same purpose
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
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