Комментарии:VEWT 52, ЭСТЯ 1, 556, 557-558, EDT 39, 62, Егоров 21, Stachowski 48. The Chuv. form is somewhat aberrant phonetically: it is possible that the actual Chuv. reflex of this root is vitǝn- `to ask' - while Chuv. avъt- (together with avtan, atan `cock', Tat. ätäč `cock') goes back to a separate PT root *ebt-, possibly going back to PA *ip`i (~-p-,-e) `to say, speak' q. v.