(ن) طَهَرَ يَطْهُرُ طَهَارَةًṭahara yaṭhuru ṭahāratan: to be pure.
طَهُوْرٌṭahūr (intensive form (ṣīghat al-mubālaghah) on the pattern of فَعُوْلٌfaʿūl): made thoroughly pure. ﴿وَاَنْزَلْنَا مِنَ السَّمَآءِ مَآءً طَهُوْرًا﴾ (Al-Furqān 25:48)
Form II (tafʿīl) طَهَّرَ يُطَهِّرُ تَطْهِيْرًاṭahhara yuṭahhiru taṭhīran: to purify thoroughly.
مُطَهَّرٌmuṭahhar (passive participle, ism mafʿūl): purified. ﴿وَثِيَابَكَ فَطَهِّرْ﴾ (Al-Muddaththir 74:4); ﴿لَّا يَمَسُّهُۥٓ اِلَّا الْمُطَهَّرُوْنَ﴾ (Al-Wāqiʿah 56:79)
Form V (tafaʿʿul) تَطَهَّرَ يَتَطَهَّرُ تَطَهُّرًاtaṭahhara yataṭahharu taṭahhuran, also اِطَّهَّرَ يَطَّهَّرُ اِطَّهُّرًاiṭṭahhara yaṭṭahharu iṭṭahhuran (used both ways): to strive to purify oneself.
اِطَّهَّرْiṭṭahhar (imperative, amr).
مُتَطَهِّرٌmutaṭahhir and مُطَّهِّرٌmuṭṭahhir (active participle, ism fāʿil): one who keeps himself pure. ﴿اِنَّ اللّٰهَ يُحِبُّ التَّوَّابِيْنَ وَيُحِبُّ الْمُتَطَهِّرِيْنَ﴾ (Al-Baqarah 2:222); ﴿وَاِنْ كُنْتُمْ جُنُبًا فَاطَّهَّرُوْا﴾ (Al-Māʾidah 5:6)