the modern Iranian language spoken in Iran and Afghanistan, developed after Old Persian and Pehlevi; Persian
See Farsi in American Heritage Dictionary 4
(färˈsē)
nounpl.Far·sis
The modern Iranian language, dating from about the ninth century A.D., that is the national language of Iran and is written in an Arabic alphabet; Persian.
a. A native speaker of Farsi.
b. A member of the predominant ethnic group of Iran.