网上有没有一种字典，当我们查一个字时解释里有词根解释的？

http://ishare.iask.sina.com.cn/f/6343355.html?all=y&retcode=0 词典下载 这是其中的词条 自己琢磨 sovereign - c.1280, from O.Fr. soverain, from V.L. *superanus, from L. super "over." Spelling influenced by reign. Meaning "gold coin worth 22s