(n) bony fishes of the southern hemisphere that breathe by a modified air bladder as well as gills; sometimes classified as an order of Crossopterygii, Syn.subclass Dipnoi
The Collaborative International Dictionary of English (GCIDE) v.0.53
‖n. pl. [ NL., fr. Gr. &unr_; &unr_; with two breathing apertures; di- = di`s- twice + &unr_; breath. ] (Zool.) A group of ganoid fishes, including the living genera Ceratodus and Lepidosiren, which present the closest approximation to the Amphibia. The air bladder acts as a lung, and the nostrils open inside the mouth. See Ceratodus, and Illustration in Appendix. [ 1913 Webster ]
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