sa·bel·la \səˈbelə\noun Etymology: New Latin, from Latin sabulum sand + New Latin -ella — more at sand 1.capitalized: a genus (the type of the family Sabellidae) of tube-dwelling marine polychaete worms with the prostomial palps modified into semicircular plumose gills 2.-s: any worm of the genus Sabella • sa·bel·li·form\-ləˌfȯrm\adjective • sabel·loid\səˈbeˌlȯid, ˈsabəˌl-\adjective or noun