|kär(ˌ)bōˈsīəˌnēn, -_nə̇n noun
or carbocyanine dye
( -s )
Etymology: International Scientific Vocabulary carb- + cyanine; originally formed as German karbozyanin
: any of a class of cyanine dyes in whose structure the two heterocyclic rings are joined by a three-carbon chain (as . CH−CH . CH−) ; specifically : any such dye containing two quinoline rings — called also trimethine