RAJA, in ichthyology, a genus belonging to the order of amphibia nantes. There are five spiracula below towards the peak; the body is compressed; and the mouth is situate under the head. There are nine species, one of which is the torpedo, or cramp-fish, found in the Mediterranean and Persian Gulph. When touched, it defends itself by a tremulous motion, which benumbs any animal which attempts to injure it.