The Collaborative International Dictionary of English v.0.48:

Coak \Coak\, v. t. (Carp.)
   To unite, as timbers, by means of tenons or dowels in the
   edges or faces. --Totten.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Coak \Coak\ (k[=o]k), n.
   See Coke, n.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Coak \Coak\, n.
   1. (Carp.) A kind of tenon connecting the face of a scarfed
      timber with the face of another timber, or a dowel or pin
      of hard wood or iron uniting timbers. [Also spelt coag.]
      [1913 Webster]

   2. A metallic bushing or strengthening piece in the center of
      a wooden block sheave.
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The Collaborative International Dictionary of English v.0.48:

Coke \Coke\, n. [Perh. akin to cake, n.]
   Mineral coal charred, or depriver of its bitumen, sulphur, or
   other volatile matter by roasting in a kiln or oven, or by
   distillation, as in gas works. It is lagerly used where ?
   smokeless fire is required. [Written also coak.]
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   Gas coke, the coke formed in gas retorts, as distinguished
      from that made in ovens.
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