This is the 6611th most frequent Arabic word.
الايراني
"The Iranian."
The term 'الايراني' here acts as an adjective describing the nationality of the scientist.
العالم الايراني هو عالم فيزياء مشهور.
The Iranian scientist is a famous physicist.
'الايراني' describes the origin of the movie.
أُعجبتُ بالفيلم الايراني الذي شاهدته الأسبوع الماضي.
I was impressed by the Iranian movie I watched last week.
The adjective 'الايراني' specifies the style or origin associated with the carpet.