thumb index
Longman Dictionary of Contemporary English 5++LDOCE 5++ˈthumb ˌindex noun [countable] TCNa line of round cuts in the edge of a large book which have the letters of the alphabet on them and help you find the part of the book you want 拇指索引,书边挖月索引
Examples from the Corpus
thumb index• Do I have a thumb index?ˈthumb ˌindex nounChineseSyllable
the Corpus in round edge of cuts line a
thumb index
ˈthumb ˌindex
noun [countable]
a line of round cuts in the edge of a large book which have the letters of the alphabet on them and help you find the part of the book you want
ˈthumb ˌindex
noun [countable]a line of round cuts in the edge of a large book which have the letters of the alphabet on them and help you find the part of the book you want