(ض) خَتَمَ يَخْتِمُ خَتْمًاkhatama yakhtimu khatman: to seal, to close up; and from this, to reach the end of something. This root occurs 8 times in the Quran. ﴿خَتَمَ اللّٰهُ عَلٰى قُلُوْبِهِمْ﴾ (Al-Baqarah 2:7); ﴿اَلْيَوْمَ نَخْتِمُ عَلٰٓى اَفْوَاهِهِمْ﴾ (Yā Sīn 36:65)
خَاتَمkhātam: seal, signet ring; and «khātam al-nabiyyīn», i.e. the seal of prophethood. ﴿وَلٰكِنْ رَّسُوْلَ اللّٰهِ وَخَاتَمَ النَّبِيِّۦنَ﴾ (Al-Aḥzāb 33:40)
خِتَامkhitām: seal, also end, conclusion. ﴿خِتٰمُهُۥ مِسْكٌ﴾ (Al-Muṭaffifīn 83:26)
مَخْتُوْمmakhtūm (passive participle, ism mafʿūl): sealed. ﴿يُسْقَوْنَ مِنْ رَّحِيْقٍ مَّخْتُوْمٍ﴾ (Al-Muṭaffifīn 83:25)
Form VIII (iftiʿāl) اِخْتَتَمَ يَخْتَتِمُ اِخْتِتَامًاikhtatama yakhtatimu ikhtitāman: to bring a task or series to its conclusion; to finish (this verb is not used in the Quran).