dialectal

基本解释

He obsessively asked friends and fellow scholars which dialectal words would be most widely understood.
他痴迷于询问朋友及共事的学者哪些方言词汇才是最广为人知的。
The writing system is not a pan-dialectal written form that ties all varieties of Chinese together, as many believe.
书写体系并非如许多人认为的那样，是汉语各种分支方言结合起来的泛方言书写形式。
But this being the language blog, I noticed something slightly more technical: Mr Mubarak avoided Zine el-Abidine ben Ali of Tunisia's gambit of giving his speech in dialectal Arabic.
不过这是个语言的博客，所以我也注意到某样技术性稍强一点的东西：穆巴拉克先生避免采取突尼斯总统宰因•阿比丁•本•阿里的演讲策略，不使用阿拉伯语的方言。

belonging or relating to a dialect (= a form of a language that people speak in a particular part of a country)