repetend
/ˈrepɪtend/noun
1- Mathematics the repeating figure or figures of a recurring decimal fraction【数】（循环小数的）循环节。
1.1
- formal a recurring word or phrase; a refrain〈正式〉重复词, 重复短语; 叠句。
词源
early 18th cent.: from Latin repetendum 'something to be repeated', neuter gerundive of repetere （see REPEAT）.