词根英语是Root word。Root word的例句：The word to which we attach the prefixes and suffixes is called the root word（被加上前缀和后缀的词称为词根）。

Root word的例句：The result of adding an affix to a root word（把词缀加在字或词前后的结果）；The word pattern is derived from the same root as the word patron（模式这个词与保护神这个词来自同一词根）。