polymethine dye
noun
: any of a class of dyes (as cyanines or merocyanines) characterized by a resonance structure containing a conjugated chain of carbon atoms that is at least in part an open chain [as in −CH(=CH−CH)n=] attached to two polar atoms (as two amino nitrogen atoms either one of which is considered to be positively charged)
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“Polymethine dye.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/polymethine%20dye. Accessed 30 Nov. 2024.
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