Comment: Obl. base *s(:)antɨ- (cf. Tsakh. santɨ-) - or *s(:)ontɨ- with Ablaut (if Lezg. -u- reflects the vocalism of the obl. base, which is rather probable). 3d class in Tsakh., but 4th class in Rut.
Despite Vinogradova-Klimov 1979, 157 the root is hardly borrowed from Arm. sand (the Arm. word itself has no IE etymology and is very probably borrowed from a Caucasian source).