phthalocyanine
noun
phtha·lo·cy·a·nine ˌtha-lō-ˈsī-ə-ˌnēn 
ˌthā-
: a bright greenish-blue crystalline compound C32H18N8
also : any of several metal derivatives that are brilliant fast blue to green dyes or pigments
Example Sentences
Recent Examples on the Web Direct Blue 199 dyeMade of copper phthalocyanine and sulfur. 
Patrick Di Justo, WIRED, 26 Apr. 2011
Patrick Di Justo, WIRED, 26 Apr. 2011 Word History
Etymology
International Scientific Vocabulary phthalic acid + -o- + cyanine
First Known Use
1933, in the meaning defined above
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