It is hard and corneous.
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera
In some, however, the feet end in a single corneous substance called a hoof.
"The Book of Household Management"
Mrs. Isabella Beeton
The winter wheats are, as a rule, more soft and starchy than the spring wheats, which are usually corneous or flinty to different degrees.
"Human Foods and Their Nutritive Value"
Harry Snyder