• Webster's Revised Unabridged Dictionary
    • n. pl Dipneumona (Zoöl) A group of spiders having only two lunglike organs.
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Century Dictionary and Cyclopedia
    • dipneumona A 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.
    • dipneumona A division of holothurians, of the order Pneumonophora, having two ramose branchiæ: opposed to Apneumona. It contains the branchiate holothurians, excepting Rhopalodina.
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. = lung