Definition of ganoid in English:

ganoid

adjective

Zoology
  • 1(of fish scales) hard and bony with a shiny enamelled surface.

    Compare with ctenoid and placoid
    • ‘Gar species in North America are easily recognized by their long snouts, sharply toothed jaws, non-overlapping and diamond shaped ganoid scales, and posterior placement of dorsal and anal fins on the body.’
    • ‘Actinopterygians may have ganoid, cycloid, or ctenoid scales, or no scales at all in many groups.’
    • ‘They also possess a heterocercal caudal fin and remnants of ganoid scales; both are uncommon among extant actinopterygians.’
    • ‘This species has specialized scales, which are called ganoid scales, and it has nostrils or nares on tentacles that protrude from the head.’
    • ‘The actinopterygians quickly jettisoned their ganoid scales and thus dispensed with the need for most endochondral bone.’
    1. 1.1 (of a fish) having ganoid scales.
      • ‘The purpose of this research is to study ganoid fish taphonomy, specifically, how each type of fish decomposes, including anatomical location and extent of postmortem damage, and possibly, its cause.’

noun

Zoology
  • A primitive fish that has ganoid scales, e.g. a sturgeon or freshwater garfish.

    • ‘I tried to follow his scheme of division into the order of ctenoids and ganoids, with the result that I found one of my species of side-swimmers had cycloid scales on one side and ctenoid on the other.’
    • ‘In the collection of ganoids the most complete is representation of Acipenseriformes, mainly of acipenserids proper.’
    • ‘The ganoids had already reached their evolutionary climax in the Permian and Triassic, some 270-190 million years ago; today they are few in number when compared with the dominant bony fishes.’
    • ‘In the ganoids the upper lobe of the tail fin is the largest.’
    • ‘Bony fishes, lungfishes, & most ganoids - retain highly cartilaginous neurocranium that is covered by membrane bone’

Origin

Mid 19th century: from French ganoïde, from Greek ganos ‘brightness’.

Pronunciation

ganoid

/ˈɡanɔɪd/