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   Ad·den·dum

   /əˈdendəm/

   

   noun

   • 1. an item of additional material added at the end of a book or document, typically in order to correct, clarify, or supplement something.
   • 2. the radial distance from the pitch circle of a cogwheel, worm wheel, etc., to the crests of the teeth or ridges.

   Word Origin late 17th century: Latin, ‘that which is to be added’, gerundive of addere (see add).

   Scrabble Points: 13

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   • D

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