English to English

noun (n)

• expandable metal or wooden wedge used by printers to lock up a form within a chase(noun.artifact)

  Synonym:
  coign, coigne
  

  source: wordnet30
• the keystone of an arch(noun.artifact)

  source: wordnet30
• (architecture) solid exterior angle of a building; especially one formed by a cornerstone(noun.artifact)

  Synonym:
  corner
  

  source: wordnet30
• Originally, a solid exterior angle, as of a building; now, commonly, one of the selected pieces of material by which the corner is marked.(noun)

  source: webster1913