scleroprotein

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of a class of generally insoluble proteins, such as collagen, found especially in skeletal and connective tissue.

from The Century Dictionary.

• noun A term suggested to designate the albuminoids which occur widely distributed in the skeletal tissues of the animal organism.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biochemistry Any of many fibrous proteins found in connective tissue etc

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a simple protein found in horny and cartilaginous tissues and in the lens of the eye