مجوس

From Aramaic 𐡌𐡂𐡅𐡔‎ (mgwš), from Old Persian 𐎶𐎦𐎢𐏁 (maguš).[1]

Was used by the Iraqi Baathist regime to refer to Iran during the Iran-Iraq War in the 1980s, and later developed into a broadly anti-Shi'a slur.

مَجُوس • (majūs) m pl (collective, singulative مَجُوسِيّ‎ m (majūsiyy))

1. (collective) Magians, (collective, historical) Zoroastrians
   • 609–632 CE, Qur'an, 22:17:

     (translated by Yusuf Ali)

     ‏إِنَّ ٱلَّذِينَ آمَنُوا وَٱلَّذِينَ هَادُوا وَٱلصَّابِئِينَ وَٱلنَّصَارَىٰ وَٱلْمَجُوسَ وَٱلَّذِينَ أَشْرَكُوا إِنَّ اللَّهَ يَفْصِلُ بَيْنَهُمْ يَوْمَ ٱلْقِيَامَةِ إِنَّ اللَّهَ عَلَى كُلِّ شَيْءٍ شَهِيدٌ‎

     ʔinna llaḏīna ʔāmanū wallaḏīna hādū waṣ-ṣābiʔīna wan-naṣārā wal-majūsa wallaḏīna ʔašrakū ʔinna l-laha yafṣilu baynahum yawma l-qiyāmati ʔinna l-laha ʕalā kulli šayʔin šahīdun

     Those who believe (in the Qur'an), those who follow the Jewish (scriptures), and the Sabians, Christians, Magians, and Polytheists,- Allah will judge between them on the Day of Judgment: for Allah is witness of all things.

2. (ethnic slur) Iranians.
3. (religious slur) Shi'as.

• → Persian: مَجوس‎ (majus)