فتح

يَوْمٌ مُنْفَتِحٌ بَالمَاآءِ ذ (tropical:) A day [ of clouds ] bursting, or opening vehemently, with rain. (A.) ― -b2- الحُرُوفُ المُنْفَتِحَةُ (assumed tropical:) The letters of which the utterance requires the opening of [ that part of the mouth which is called ] the حَنَك; (TA;) all the letters of the alphabet except ص, ض, ط, and ظ. (K, TA.)