an external body part that projects from the body

any of the stiff bony spines in the fin of a fish

any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills

show the fins above the water while swimming

propel oneself through the water in a finning motion

unpaired median fin on the backs of fishes and some other aquatic vertebrates that help to maintain balance

either of a pair of fins situated just behind the head in fishes that help control the direction of movement

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

the tail of fishes and some other aquatic vertebrates

any of the stiff bony spines in the fin of a fish

any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills