tracing - definition and synonyms

noun 

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/ˈtreɪsɪŋ/
singulartracing
pluraltracings
  1. 1
    [countable] a copy made by putting transparent paper on top of an image and following the lines with your pencil
  2. 2
    [countable/uncountable] medical a process in which a substance is passed through someone’s body to show where a problem is