parasang
noun
par·a·sang ˈper-ə-ˌsaŋ 
ˈpa-rə-
: any of various Persian units of distance
especially : an ancient unit of about four miles (six kilometers)
Word History
Etymology
Latin parasanga, from Greek parasangēs, of Iranian origin; akin to Persian farsung parasang
First Known Use
1594, in the meaning defined above