phy·co·cyanin \|fīkō+\noun orphy·co·cy·an\ˌ ̷ ̷ ̷ ̷ˈsīˌan, -_ən\ (-s) Etymology:phycocyanin International Scientific Vocabulary phycocyan + -in; phycocyan International Scientific Vocabulary phyc- + -cyan : any of the bluish green protein pigments in the cells of blue-green algae