ھ م رh-m-r
(ن) هَمَرَ يَهْمُرُ هَمْرًاhamara yahmuru hamran: (of water) to pour and flow forcefully.
Form VII (infiʿāl) اِنْهَمَرَ يَنْهَمِرُ اِنْهِمَارًاinhamara yanhamiru inhimāran: to pour down in torrents, to flow continuously; مُنْهَمِرmunhamir (active participle, ism fāʿil). Only once in the Quran, in the account of the flood of Nūḥ: ﴿فَفَتَحْنَاۤ أَبْوَابَ السَّمَاءِ بِمَاءٍ مُّنْهَمِرٍ﴾ (Al-Qamar 54:11).