Fin

A fin is a thin, often membranous, appendage attached to the body of an aquatic animal, used for propulsion, steering, or stabilization in water. Fins are typically supported by bony or cartilaginous rays and come in a variety of shapes and sizes depending on the animal's environment and function. Beyond aquatic animals, the term 'fin' can also apply to any similar projecting structure, like the stabilizing fins on a missile or aircraft. The word itself hints at the sharp, pointed nature of these appendages, crucial for navigating the liquid world or the air, helping these creatures to find their way.

Fin meaning with examples

• The shark sliced through the water with impressive speed, its dorsal fin cutting through the waves like a knife. The distinctive shape of its fin helped identify the species from a distance. Its strong muscles work hard to move the fin. The shark has a few fins to help control direction and balance. The fin helps this hunter pursue prey.
• As the fish propelled itself forward, its pectoral fins provided the necessary lift and maneuverability to navigate through the coral reefs, finding the perfect places for food and shelter. Its other fins helped it too. The fins were delicate and beautiful. They used the fins to find the nutrients it needed to thrive. The fins are also good at helping them find each other.
• The fighter jet's vertical fin, emblazoned with the national emblem, ensured stability and controlled direction during high-speed maneuvers, especially during sudden changes in direction. The fin was so important to the flight of the jet. Without the fin the plane would be out of control. The fin helped the jet find its place in the sky. The fin has to be strong.
• The submarine's sonar picked up the distinct vibration of a whale's flukes and the graceful movement of its pectoral fins, both of which helped determine the whale's location and direction in the vast ocean, aiding in its quest to find food and mates. The fin helps the whale to breathe. The fins show you a little about the animal. The fins help the whale find what it needs. Fins look beautiful on display.
• The model rocket soared into the sky, guided by its precisely placed stabilizing fins. The fins ensured a straight trajectory. Without fins, it would have spun uselessly. The design of the fins was essential for the rocket's flight. It was built to find its way through the sky. The fins allowed it to find the destination.