First attested in Firdawsī, 1010 AD. Of unknown etymology due to not having any clear cognates, but potentially borrowed from Southeastern Iranian; Herzenberg compares Pashto لستوڼي (lastúṇay, “sleeve”) which is related to Pashto لاس (lás, “hand”) with a /d-/ > /l-/ sound shift in some Eastern Iranian languages, then cites some dialectal Persian terms borrowed from Pashto or a related language where the initial /l-/ has been dropped.