ablaut

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）.

abduction, abductor, abeam, aberrant, aberration, abet, abeyance, abhor, abhorrence, abhorrent, abide, abide by, abiding, ability, ability to, abject, abjectly, abjuration, abjure, ablative, ablaze, able, able to, able(-bodied) seaman, able-bodied, ablution, ably, ABM, abnegate, abnegation, abnormal, abnormality, abnormally, Abo, aboard, abode, abolish, abolition, abolitionism, abolitionist,