-səs noun
Usage: capitalized
Etymology: New Latin, from balan- + -glossus (from Greek glōssa tongue) — more at gloss
: a genus of marine burrowing wormlike animals that because of certain vertebratelike characters are not usually classed as chordates and made with certain closely related forms (as Dolichoglossus ) to constitute an order (Enteropneusta) of the Hemichorda