noun · A regional variety of a language distinguished by features of vocabulary, grammar, and pronunciation.

他说话带着很重的方言口音。

noun · the first Chinese dialect dictionary, edited by Yang Xiong 扬雄 Yáng Xióng in the 1st century, containing over 9000 characters

他在研究古代词汇时，多次参考了扬雄编写的方言。