scleroderm

Etymology
.

Noun

 * 1)  One of a tribe of plectognath fishes  having the skin covered with hard scales, or plates, such as the cowfish and trunkfish.
 * 2)  One of the ; a madrepore.
 * 3) A hardened or bony integument of various animals.
 * 1) A hardened or bony integument of various animals.