رَعْدٌ

Thunder; i. e. the sound that is heard from the clouds, (S, K, *) or from the sky: (A:) so say the people of the desert: (Akh, TA:) [thus termed as being supposed to be a trembling, or state of agitation, of the clouds, as is implied in the Ksh and the Expos. of Bd in ii. 18, where it is said to be from الاِرْتِعَاد, or as being a cause of trembling:] originally a verbal noun, and therefore [it is said that] it has no plural: (Bd ubi suprà:) [but see what follows, in which رُعُودٌ occurs, perhaps as its plural:] or الرَّعْدُ is the name of an angel who drives the clouds [with his voice] like as a man drives camels with singing. (I'Ab, Z, K.)

[Hence,] جَاءَ بِذَاتِ الرَّعْدِ وَالصَّلِيلِ i. e. (assumed tropical:) [He brought, or brought to pass, that which had thunder and noise; meaning,] (tropical:) war: (S, K, TA:) or calamity: (A, TA:) and بِذَوَاتِ ↓ الرَّوَاعِدِ (tropical:) calamities: (A:) [for] ↓ ذَاتُ الرَّوَاعِدِ [in the CK ذَواتُ] signifies calamity. (S, K, TA.) And فِى كِتَابِهِ رُعُودٌ وَبُرُوقٌ [which may be rendered In his letter are thunders and lightnings;] meaning, (tropical:) words of threatening. (A.)