COMMENT: Initial *ɫ- is proved by the PL and Gunz. forms. In PN and PD class prefixes were added which led to the shift of *ɫ- to the stem's end; the inanimate class prefix *r- > *d- was later petrified in PN. Processes like this are quite usual for adjectival and verbal roots. In general the etymology seems quite plausible.
