/ Dictionary / Index P phycocyanin: Meaning and Definition of Find definitions for: phy•co•cy•an•in Pronunciation: (fī"kō-sī'u-nin), [key] — n. Biochem. a blue protein pigment, found in algae, involved in the process of photosynthesis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: phycocyanin (Thesaurus) phycobiont phycoerythrin Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language