ganoid

1. Having a smooth, shining surface, as if polished or enameled: specifically applied to those scales or plates of fishes which are generally of an angular form and composed of a bony or hard horny tissue overlaid with enamel.
2. Having ganoid scales or plates, as a fish; specifically, of or pertaining to the Ganoidei.

   In a few minutes the huge beast had been cut up and slabs of him were hanging over a dozen camp fires, together with great scaly ganoid fish which had been speared in the lake.

   1912, Arthur Conan Doyle, The Lost World […], London; New York, N.Y.: Hodder and Stoughton, →OCLC

plural ganoids

1. biologyOne of the Ganoidei, a disused taxonomic grouping of fishes, including the bowfin, gars, and sturgeons.