Comment: Cf. also Tab. Düb. marʒi 'clean', Arch. marc̣: as 'to clean' (for *-c̣:-). In Udi we have mac:i 'white' ( < *maIrc̣:ɨ-), but ac:ar 'clean'; the latter reflects the original verbal structure *Hac̣:V(m)-.
See Бокарев 1961, 71; Лексика 1971, 227; Гигинейшвили 1977, 107.