[1] : The Collaborative International Dictionary of English v.0.48

coigne \coigne\ koin, n. see coin, n.
   a quoin.
   1913 webster

         see you yound coigne of the capitol? yon corner stone?
                                                  --shak.
   1913 webster coigne
see also:
coin 

[2] : The Collaborative International Dictionary of English v.0.48

coigne \coigne\, coigny \coign"y\, n.
   the practice of quartering one's self as landlord on a
   tenant; a quartering of one's self on anybody. ireland
   --spenser.
   1913 webster

[3] : WordNet (r) 2.0

coigne
     n 1: expandable metal or wooden wedge used by printers to lock up
          a form within a chase syn: quoin, coign
     2: the keystone of an arch syn: quoin, coign
see also:
quoin coign 

Coigne >> C Words
Coigne, definition of term: Coigne
coigne_pag1.html