Definition of tracery noun from the Oxford Advanced American Dictionary

     

    tracery

     noun
    noun
    NAmE//ˈtreɪsəri//
     
    (pl. traceries)
     
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  1. 1[uncountable] (technology) a pattern of lines and curves in stone on the top part of some church windows
  2. 2[uncountable, countable, usually singular] (literary) an attractive pattern of lines and curves the delicate tracery of ice on the window
See the Oxford Advanced Learner's Dictionary entry: tracery