coag

from The Collaborative International Dictionary of English v.0.48
Coag \Coag\, n.
   See {Coak}, a kind of tenon.
   [1913 Webster]
from 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.
      [1913 Webster]
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