tylen·choi·dea \ˌtīˌleŋˈkȯidēə, ˌtiˌl-, -enˈk-\noun plural Usage: capitalized Etymology: New Latin, from Tylenchus + -oidea : a superfamily of soil-dwelling or plant-parasitic nematodes (order Rhabditida) with a dorsal esophageal gland opening near the base of the buccal spear — see heterodera, tylenchidae