س ج رs-j-r
(ن) سَجَرَ يَسْجُرُ سَجْرًاsajara yasjuru sajran: to heat an oven thoroughly; to kindle a fire; also to fill up. ﴿ثُمَّ فِي النَّارِ يُسْجَرُوْنَ﴾ (Ghāfir 40:72)
مَسْجُوْرٌmasjūr (passive participle, ism mafʿūl): kindled, or filled to the brim — the exegetes have mentioned both senses for «الْبَحْرِ الْمَسْجُوْرِal-baḥr al-masjūr»: the brimming sea, or the sea that will become fire on the Day of Resurrection. ﴿وَالْبَحْرِ الْمَسْجُوْرِ﴾ (Aṭ-Ṭūr 52:6)
Form II (tafʿīl) سَجَّرَ يُسَجِّرُ تَسْجِيْرًاsajjara yusajjiru tasjīran: to kindle fiercely. ﴿وَاِذَا الْبِحَارُ سُجِّرَتْ﴾ (At-Takwīr 81:6)This root occurs 3 times in the Quran.