phytosanitary Syllabification: (phy·to·san·i·tar·y)Pronunciation: /ˌfītōˈsaniterē/Definition of phytosanitary adjective (of agricultural goods crossing borders) sanitary with regard to pests and pathogens:a point-of-origin phytosanitary certificatephytosanitary in other Oxford dictionaries Definition of phytosanitary in the British & World English dictionary