Main Entry: phy·to·tox·ic Pronunciation: "fIt-&-'täk-sik Function: adjective 1: of or relating to a phytotoxin 2: poisonous to plants <phytotoxic property of pernicious anemia serum —Journal of the American Medical Association> —phy·to·tox·ic·i·ty/-täk-'sis-&t-E/nounplural-ties