dictionary help| shale | medical dictionary |
1. A shell or husk; a cod or pod. "The green shales of a bean."
2. [G. Shale.
<geology> A fine-grained sedimentary rock of a thin, laminated, and often friable, structure. Bituminous shale. See Bituminous.
Origin: AS. Scealy, scalu. See Scalme, and cf. Shell.
(01 Mar 1998)
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