a sedimentary rock formed by the deposition of successive layers of clay
"The geologist explained that the slate roof was originally shale, a sedimentary rock formed by the deposition of successive layers of clay."
A shell or husk; a cod or pod.
"After peeling the thick outer layer off the crab, she carefully scooped out the rich meat from inside the hard shale."
To take off the shell or coat of.
"The old oyster farmer carefully shaled each mussel before placing them in the market display."