Comments:ССЕ 220. The root proper is *de- (cf. the Arin form representing an original pluralm as well as Kott. te-gan, te-kan 'light' = 'eye' + 'light', see *gǝʔn); the final *-s is a singulative morpheme (cf. -sa in *xu-sa 'one', as well as *pa 'time(s)' : *pa-s 'one time'). Werner 1, 187 <*det' / *des>.