Definition of pycnodont in English:

pycnodont

noun

  • Any of various extinct holostean fishes of the family Pycnodontidae or order Pycnodontiformes, which are usually deep-bodied and characterized by a pavement of crushing teeth in the upper and lower jaws, and are known from fossils of the Mesozoic era.

adjective

  • Of, relating to, or belonging to this group of fishes.

Origin

Mid 19th century; earliest use found in William Buckland (1784–1856), geologist and dean of Westminster. Probably after French pycnodontes, plural noun; compare scientific Latin Pycnodus, genus name.