نيسان naisān P s. m. Name of the 7th Syrian month, corresponding to the Persian فروردين and Hindī بيساکهہ baisākh. ابرنيسان abr-i-naisān, or ابرنيساني abr-i-naisānī, 1. The vernal cloud or rain. 2. The rain which falls while the moon is in the mansion swāti; and of which, if it drops into a shell, pearls are formed; but which turns to poison, if it happens to fall into the mouth of a serpent. See سوات swāti.