Definitions
from The Century Dictionary.
- A division of Dipnoi, or lung-fishes, containing the mudfishes of the genera Lepidosiren and Protopterus, as distinguished from
Monopneumona (Ceratodus). - A division of holothurians, of the order Pneumonophora, having two ramose branchiæ: opposed to Apneumona. It contains the branchiate holothurians, excepting Rhopalodina.
from the GNU version of the Collaborative International Dictionary of English.
- noun plural (Zoöl.) A group of spiders having only two lunglike organs.
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