noun.
Any fish of the genus Callichthys; any catfish of the family Loricariidæ, found in the fresh waters of South America.
noun.
In the British West Indies and British Guiana, any large beetle, especially one of the larger Scarabæidæ.
the GNU version of the Collaborative International Dictionary of English
adjective.
Having rigid front and back covers, usually boards covered with paper, cloth, or leather; -- of books. Contrasted with softcover and paperback.
noun.
A book with cardboard or cloth or leather covers; a hardcover book. Compare paperback.