sclerotin
/ˈsklɪərətɪn/noun
mass noun
- Biochemistry a structural protein which forms the cuticles of insects and is hardened and darkened by a natural tanning process in which protein chains are cross-linked by quinone groups【生化】骨质, 壳硬蛋白（充斥于昆虫表皮几丁质分子团空隙之间的一种蛋白质物质）。
词源
1940s:from sclero- 'hardened'， on the pattern of such words as keratin.