/gan"oyd/ , adj.
1. of or pertaining to the Ganoidei, a group of mostly extinct fishes characterized by hard, bony scales, the living species of which include the paddlefishes, sturgeons, and gars.
2. (of the scale of a fish) having a smooth, shiny surface of ganoin or a similar substance.
n.
3. a ganoid fish.
[ 1830-40; ganoïde gán ( os ) brightness + -oïde -OID ]