词根：tauto = same （相同）

tautology 同义反复，累赘

词根词缀：tauto-, taut-

【来源及含义】Greek: same

【相关词根词缀】 Inter-related cross references, directly or indirectly, involving word units dealing with "equal, identical, same, similar": auto-; emul-; equ-, equi-; homeo-; homo-; iso-; pari-; peer; rhomb-; syn-.

【同源单词】redundancies, tautegorical, tautochrome, tautochromism, tautochrone, tautochronism