Sailfish (noun)

1. A marine fish, Istiophorus platypterus, of tropical and temperate seas, having a large dorsal fin that can be raised like a sail.
2. A large predatory fish with a long pointed dorsal fin that looks like a sail.

Origin:

From sail + fish.

Examples:

1. The sailfish is a fast swimmer and can reach speeds of up to 68 miles per hour.
2. Sailfish are known for jumping out of the water and using their dorsal fin to catch prey.
3. Sailfish are highly prized by sport fishermen for their speed and power.
4. The sailfish is a popular game fish due to its fierce fight when caught.
5. Sailfish are found in the warm waters of the Atlantic, Pacific and Indian oceans.