shale /ˈʃe(ə)l/
 頁岩,泥板岩


 Shale n.
 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.

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 shale
      n : a sedimentary rock formed by the deposition of successive
          layers of clay