fish any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills; "the shark is a large fish"; "in the living room there was a tank of colorful fish"
ray cartilaginous fishes having horizontally flattened bodies and enlarged winglike pectoral fins with gills on the underside; most swim by moving the pectoral fins
dorsal fin unpaired median fin on the backs of fishes and some other aquatic vertebrates that help to maintain balance
pectoral fin either of a pair of fins situated just behind the head in fishes that help control the direction of movement
pelvic fin,
ventral fin either of a pair of fins attached to the pelvic girdle in fishes that help control the direction of movement; correspond to hind limbs of a land vertebrate
fin -
a stabilizer on a ship that resembles the fin of a fish
fin -
A similar structure on the tail of a bomb, used to help keep it on course.
fin -
A hairstyle, resembling the fin of a fish, in which the hair is combed and set into a verticalridge along the top of the head from about the crown to the forehead.
fin -
A device worn by divers and swimmers on their feet.
A fin is a surface used to produce lift and thrust or to steer while traveling in water, air, or other fluid media. The first use of the word was for the limbs of fish, but has been extended to include other animal limbs and man-made devices. The foremost use of fins is to ensure the directional stability of an object moving through a fluid such as water or air and may be seen in the use of fletching on arrows and fins at the rear of some missiles, rockets, self-propelled torpedoes, and kinetic energy penetrators.
