Source : Webster's Revised Unabridged Dictionary (1913)

Corneocalcareous \Cor"ne*o*cal*ca"re*ous\
   (k?rn?-?-k?l-k?"r?-?s), a.
   1. (Zo["o]l.) Formed of a mixture of horny and calcareous
      materials, as some shells and corals.

   2. Horny on one side and calcareous on the other.