Home › Words › P › phytoadditivephytoadditivephytoadditive means A veterinary feed additive derived from botanicals.Among words judged in Lexicurio's Arena, phytoadditive ranks #35,941 of 42,749 for Qualifying.EtymologyPhyto- + additivenounA veterinary feed additive derived from botanicals.Definitions & examples from Wiktionary (CC BY-SA 3.0).