pyocyanin

noun
pyo·cy·a·nin | \ˌpī-ō-ˈsī-ə-nən \
variants: or pyocyanine \-ˌnēn \

Medical Definition of pyocyanin 

: a toxic blue crystalline pigment C13H10N2O that is formed in the metabolism of a bacterium of the genus Pseudomonas (P. aeruginosa), gives a bluish tint to pus infected with this organism, is a quinone imine related to phenazine, and has antibiotic activity especially toward gram-positive bacteria

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