sketchbook Syllabification: (sketch·book)Pronunciation: /ˈskeCHˌbo͝ok/Translate sketchbook | into French | into German | into Italian | into Spanish Definition of sketchbook noun (also sketchpad /-ˌpad/) a pad or book of drawing paper for sketching on. a book of drawings or literary sketches. sketchbook in other Oxford dictionaries Definition of sketchbook in the British & World English dictionary