n. plDipneumona(Zoöl) A group of spiders having only two lunglike organs.
Century Dictionary and Cyclopedia
dipneumonaA division of Dipnoi, or lung-fishes, containing the mudfishes of the genera Lepidosiren and Protopterus, as distinguished from Monopneumona (Ceratodus). They have the lungs paired, a conus arteriosus resembling that of the batrachians, and slender paired fins, with a jointed cartilaginous axis having rays only on one side. See cuts under Lepidosiren and mudfish.
dipneumonaA division of holothurians, of the order Pneumonophora, having two ramose branchiæ: opposed to Apneumona. It contains the branchiate holothurians, excepting Rhopalodina.