ل م حl-m-ḥ
(ف) لَمَحَ يَلْمَحُ لَمْحًاlamaḥa yalmaḥu lamḥan: (of lightning or a star) to flash; for the glance to fall fleetingly, to blink (this verb is not used in the Quran).
لَمْحٌlamḥ (verbal noun, maṣdar; also a noun, ism dhāt): the blink of an eye, a glance. ﴿وَمَآ اَمْرُ السَّاعَةِ اِلَّا كَلَمْحِ الْبَصَرِ﴾ (An-Naḥl 16:77); ﴿وَمَآ اَمْرُنَآ اِلَّا وَاحِدَةٌ كَلَمْحٍۢ بِالْبَصَرِ﴾ (Al-Qamar 54:50)