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Meaning of phytoalexin

phy•to•a•lex•in

Pronunciation: (fī"tō-u-lek'sin), [key]
— n. Biochem.
  1. any of a class of plant compounds that accumulate at the site of invading microorganisms and confer resistance to disease.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.