1) Horny plates of reptiles 
Large scales. Usually means much the same as plate, lamina, shield (Peters 1964).
Bony external plate or scale, as on the shell of a turtle, the skin of crocodilians, or the feet of some birds.
Another word for keratin scales. Refers especially to the keratin scales on the outer layer of turtle shells. Sometimes called horny scutes.
Horny plates or thorny scales, as on the shell of a sea turtle or body of a sturgeon, respectively.
a horny plate on the shell of a turtle