/i lek'troh ri sep"teuhr/ , n. Zool.
any of an array of tiny, electrically sensitive ampullar organs present in sharks, electric eels, catfish, and certain other fishes, each organ being composed of a bundle of nerve fibers and sensory cells within a gel-filled conducting duct that can pick up weak electrical currents emitted by creatures moving in the water.
[ ELECTRO- + RECEPTOR ]