Dipnoi

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Dipnoi \Dip"no*i\, n. pl. [NL., fr. Gr. ? ? with two breathing
     apertures; di- = di`s- twice + ? 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]

From WordNet (r) 2.0 [wn]:

  Dipnoi
       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}]