the GNU version of the Collaborative International Dictionary of English
adj. Of a texture resembling horn; horny; hard.
The Century Dictionary and Cyclopedia
Horny; like horn; consisting of a horny substance, or a substance resembling horn.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. made of horn (or of a substance resembling horn)
Word Usage
"WildBirdontheFly asked for Twittered bird-related poems that included the word "corneous" I thought of the bark of this tree and the White-headed Woodpeckers I saw there."