1. A shell or husk; a cod or pod. “The green shales of a bean.”
2. Geol. A fine-grained sedimentary rock of a thin, laminated, and often friable, structure.
Bituminous shale. See under Bituminous.
Shale, v. t. To take off the shell or coat of; to shell.
Life, in its upper grades, was bursting its shell, or was shaling off its husk. --I. Taylor.
n : a sedimentary rock formed by the deposition of successive
layers of clay