deriv LSK ETT STT aSTA ALPH OLDHOMEPAGE NEWHOMEPAGE

/os / ओस्

/os is the dual /sup in sixth group /GasosAm and in seventh group /Gyossup. So it may mean "of" or "in".

**parvata- पर्वतॱ + sixth /os → !**parvatayos पर्वतयोस् "of two mountains"

**parvata- पर्वतॱ + seventh /os → **parvatayos पर्वतयोस् "at two mountains"