sketchbook - definition and synonyms

noun [countable] 

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/ˈsketʃˌbʊk/
singularsketchbook
pluralsketchbooks
singularsketchpad
pluralsketchpads

or sketchpad 

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/ˈsketʃˌpæd/

  1. a book with blank pages (=with nothing printed on them), used for drawing