A bony deposit in the form of a plate or scale found in the dermal layers of the skin (Peters 1964).

Bony outgrowth of skin. Typical trait in titanosaurids and thyreophorans.

any bone imbedded in the skin. Osteoderms include the scutes of crocodiles, the keeled scutes, spines, and tail-club bones of ankylosaurs, and the plates, spines, and gular ossicles of stegosaurs. Their function is usually for protection and display