corneous

It had vanished during his babyhood leaving only a corneous spot on his skull; but people were glad when Tomlin died.

From Time Magazine Archive

The head is of a corneous, opaque substance.

From Chambers's Edinburgh Journal, No. 451 Volume 18, New Series, August 21, 1852 by William Chambers

In some, however, the feet end in a single corneous substance called a hoof.

From The Book of Household Management by Mrs. (Isabella Mary) Beeton

Base of these wings in the male with a strong bristle passing behind a strong corneous retinaculum, which arises from the anterior side of the sub-costal nervure.

From Discoveries in Australia, Volume 1. With an Account of the Coasts and Rivers Explored and Surveyed During The Voyage of H.M.S. Beagle, in the Years 1837-38-39-40-41-42-43. By Command of the Lords Commissioners of the Admiralty. Also a Narrative Of Captain Owen Stanley's Visits to the Islands in the Arafura Sea. by John Lort Stokes

Squamula: a small corneous scale covering the base of primaries in some insects: = tegula, q.v.: in Diptera, = alula.

From Explanation of Terms Used in Entomology by John. B. Smith