ablaut/ˈæblaut; `æblaʊt/ n[U](linguistics 语言) systematic way in which vowels change in related forms of a word, esp in Indo-European languages (eg drive, drove, driven) 元音交替（尤指在印欧语系中, 一个词的相关形式中有规律的变化, 如 drive, drove, driven）.
牛津英汉双解词典