Fortunatov's law is the observation, in the development of Indo-Aryan from Proto-Indo-European, that when *l is followed by a dental consonant, the dental becomes retroflex and the *l is deleted, eg. PIE *bðelsos > Sanskrit bhÃÂÃÂá¹£ÃÂ, Lithuanian balÃÂsas; PIE *poltos > Sanskrit paá¹Âa, Greek péltÃÂ, Farsi parde; PIE *geldos, Sanskrit jaá¸Âa, English cold; PIE *kol(hâÂÂ)dos, Sanskrit kaá¸Âa, Norwegian halt. Exception: PIE *plÃÂ¥thâÂÂ-éwihâÂÂ, Sanskrit pá¹ÂthvëÃÂ.