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A stable blue-green porphyrin-based organic dye, C32H18N8, or any of several blue-green derivatives containing chelated metals, used in enamels, printing inks, linoleum, and plastics.
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.
phthalocyanine(ˌθæləʊˈsaɪəˌniːn; ˌθeɪ-; ˌfθæl-) or
1. (Elements & Compounds) a cyclic blue-green organic pigment. Formula: (C6H4C2N)4N4H4
2. (Elements & Compounds) any of a class of compounds derived by coordination of this compound with a metal atom. They are blue or green pigments used in printing inks, plastics, and enamels
[C20: from phthal- (see phthalein) + cyanine]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
phthal•o•cy•a•nine(ˌθæl əˈsaɪ əˌnin, -nɪn, ˌfθæl-)
any of a group of blue-green pigments, esp. C32H18N8 (metal-free phthalocyanine), used to make enamels, printing inks, and automotive finishes.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.