(ن) سَطَرَ يَسْطُرُ سَطْرًاsaṭara yasṭuru saṭran: to guard a thing; to write something down (so that it is preserved). ﴿نٓ وَالْقَلَمِ وَمَا يَسْطُرُوْنَ﴾ (Al-Qalam 68:1)
مَسْطُوْرٌmasṭūr (passive participle, ism mafʿūl): written. ﴿وَكِتٰبٍ مَّسْطُوْرٍ﴾ (Aṭ-Ṭūr 52:2)
مُصَيْطِرٌmuṣayṭir: a guardian; an overseer; this is in fact مُسَيْطِرٌmusayṭir, which is why in the Quran a small sīn is written above its ṣād. ﴿لَسْتَ عَلَيْهِمْ بِمُصَيْطِرٍ﴾ (Al-Ghāshiyah 88:22)
Form II (tafʿīl) سَطَّرَ يُسَطِّرُ تَسْطِيْرًاsaṭṭara yusaṭṭiru tasṭīran: to collect baseless tales; to make up fictitious stories or legends; to write fiction or novels.
اُسْطُوْرَةٌusṭūrah pl. اَسَاطِيْرُasāṭīru (noun, ism dhāt): a fictitious tale; a legend. ﴿اِنْ هٰذَآ اِلَّآ اَسَاطِيْرُ الْاَوَّلِيْنَ﴾ (Al-Anʿām 6:25)
Form VIII (iftiʿāl) اِسْتَطَرَ يَسْتَطِرُ اِسْتِطَارًاistaṭara yastaṭiru istiṭāran: to write with care; مُسْتَطَرٌmustaṭar (passive participle, ism mafʿūl): written. ﴿وَكُلُّ صَغِيْرٍ وَّكَبِيْرٍ مُّسْتَطَرٌ﴾ (Al-Qamar 54:53)