Definition of microdot noun from the Oxford Advanced American Dictionary

     

    microdot

     noun
    noun
    NAmE//ˈmaɪkroʊˌdɑt//
     
     
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  1. 1a very small photograph about one millimeter in size, usually of a printed document
  2. 2a very small round piece of a drug, especially the illegal drug LSD
See the Oxford Advanced Learner's Dictionary entry: microdot