The Collaborative International Dictionary of English v.0.48:

Ancon \An"con\, Ancone \An"cone\, n. [See Ancon, above.]
   (Arch.)
   (a) The corner or quoin of a wall, cross-beam, or rafter.
       [Obs.] --Gwilt.
   (b) A bracket supporting a cornice; a console.
       [1913 Webster] Anconal