thesaurus /θɪˈsorəs/ noun plural thesauri /-ˈsoɚˌaɪ/ /θɪˈsoɚˌaɪ/ or thesauruses /-ˈsorəsəz/ /θɪˈsorəsəz/ plural thesauri /-ˈsoɚˌaɪ/ /θɪˈsoɚˌaɪ/ or thesauruses /-ˈsorəsəz/ /θɪˈsorəsəz/ Learner's definition of THESAURUS
[count]
: a book in which words that have the same or similar meanings are grouped together同义类词典；同义词词典