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Answer for the clue "A toxic blue crystalline antibiotic found in green pus ", 9 letters:
pyocyanin

Word definitions for pyocyanin in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Pyocyanin \Py`o*cy"a*nin\, n. [Gr. ? pus + ? dark blue.] (Physiol. Chem.) A blue coloring matter found in the pus from old sores, supposed to be formed through the agency of a species of bacterium ( Bacillus pyocyaneus ).

WordNet Word definitions in WordNet
n. a toxic blue crystalline antibiotic found in green pus

Wikipedia Word definitions in Wikipedia
Pyocyanin (PCN) is one of the many toxins produced and secreted by the Gram negative bacterium Pseudomonas aeruginosa . Pyocyanin is a blue, secondary metabolite with the ability to oxidise and reduce other molecules and therefore can kill microbes competing ...

Wiktionary Word definitions in Wiktionary
n. (context biochemistry English) A greenish-blue pigment, produced by ''Pseudomonas aeruginosa'', that is an antibiotic and antifungal agent