Ganoid a. : Of or pertaining to Ganoidei. -- n. One of the Ganoidei.

Example:
What chapter in The Education of Henry Adams does he talk about the Ganoid fish and magnets?

Taxonomy
scales, Fish scales, Cycloid scales, Ganoid scales, Ctenoid, zoology, plates, free encyclopedia, Placoid scales, Reptilian scales, scale development, reptile scales, Keeled scales, coloration, Leptoid, inner layer, teeth, osteoderms.

Defination from the web:
Ganoid) Jump to: navigation, search ... Ganoid scales are similar to cosmoid scales, but a layer of ganoin lies over the cosmine layer and under the enamel. They are diamond-shaped, shiny, and hard. ...