1) Fish 2) Lancet fish 3) Malacopterygian 4) Soft-finned fish 5) Wolffish 
USS Lancetfish was an American Balao Class submarine of 1525 tons displacement launched in 1943 which saw action during the Second World War. USS Lancetfish was powered by diesel engines providing a top speed of 21 knots and was armed with one 4-inch gun, two 20 mm Oerlikon anti-aircraft guns; six 21 inch bow torpedo tubes and four 21 inch stern to...
[n] - large elongate scaleless oceanic fishes with sharp teeth and a long sail-like dorsal fin
lancet fish noun large elongate scaleless oceanic fishes with sharp teeth and a long dorsal fin that resembles a sail