An Etymological Dictionary of Astronomy and Astrophysics

A large, usually continuous segment of a surface or space; area. → H II region.

Etymology (EN): M.E., from Anglo-Fr. regioun; O.Fr. region, from L. regionem (nominative regio) “district, country, direction, boundary,” from regere “to direct,” cognate with Pers. râst, → right.

Etymology (PE): Nâhiyé, loan from Ar. nâHiyat.