Comments:The root is rather difficult to distinguish from *k`et[o] q. v.; contaminations may explain partial vocalic irregularities. Mong. *kidu- is usually compared with Turk. *Kɨd- 'to destroy' (thus KW 244, VEWT 261, TMN 1, 487-488), but this form probably does not exist: in OT (8th c.) there is a dubious Hap. leg. qɨdmaz 'did not spare (?)', but all other sources (starting with MK) have only *Kɨj- and its reflexes (see EDT 595) - which is quite a different root, see *gijo.