فِتَرٌّ

and ↓ فَتْرَةٌ A certain fish, (O, K,) speckled, and having upon it a blackness, (O,) such that when a man treads upon it, he is affected with a languor (in some copies of the K a tremour) in his legs, (O, K,) so that he becomes drowned, thus described by Ibn-' Abbád, (O,) or so that he sweats: (thus in copies of the K:) it is the رَعَّادَة [or torpedo], found in the Nile of Egypt. (TA.)