‖n. [ NL., fr. Gr. "ra`bdos a rod + &unr_;&unr_;&unr_;&unr_; the side.] (Zool.) A genus of marine Bryozoa in which the tubular cells have a centralchitinous axis and the tentacles are borne on a bilobed lophophore. It is the type of the order Pterobranchia, or Podostomata [1913 Webster]