ˌsed ə n.ˈta(a)rēə noun plural
Usage: capitalized
Etymology: New Latin, from Latin, neuter plural of sedentarius sedentary
in some classifications : a division of Polychaeta comprising sedentary usually tube-dwelling worms with reduced parapodia and sense organs and typically with highly developed filamentous anterior respiratory organs or gills — compare errantia , sabellaria