Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various fishes of the group Dipnoi, which includes the lungfishes, characterized by modified lungs that enable them to breathe atmospheric air.
  • adj. Of or belonging to the Dipnoi.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of several fish, of the family Dipnoi, that have modified lungs and can breath out of water

from The Century Dictionary and Cyclopedia

  • Pertaining to or having the characters of the Dipnoi. Also dipneustal.
  • n. One of the Dipnoi; a lung-fish.

Etymologies

From New Latin Dipnoī, order name, from Greek dipnooi, pl. of dipnoos, having two apertures for breathing : di-, two; see di-1 + pnoē, breath (from pnein, to breathe; see pneu- in Indo-European roots).
(American Heritage® Dictionary of the English Language, Fourth Edition)

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