S: (n) parapodium (one of a pair of fleshy appendages of a polychete annelid that functions in locomotion and breathing)
S: (n) fin (organ of locomotion and balance in fishes and some other aquatic animals)
S: (n) dorsal fin (unpaired median fin on the backs of fishes and some other aquatic vertebrates that help to maintain balance)
S: (n) pectoral fin (either of a pair of fins situated just behind the head in fishes that help control the direction of movement)
S: (n) 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)
S: (n) heterocercal fin (a tail fin with unequal lobes in which the vertebral column turns upward into the larger lobe as in sharks)
S: (n) homocercal fin (symmetrical tail fin extending beyond the end of the vertebral column as in most bony fishes)
S: (n) swimmeret, pleopod (one of the paired abdominal appendages of certain aquatic crustaceans that function primarily for carrying the eggs in females and are usually adapted for swimming)
S: (n) limb (one of the jointed appendages of an animal used for locomotion or grasping: arm; leg; wing; flipper)
S: (n) hind limb, hindlimb (a posterior appendage such as a leg or the homologous structure in other animals)
S: (n) thigh (the part of the leg between the hip and the knee)
S: (n) lap (the upper side of the thighs of a seated person) "he picked up the little girl and plopped her down in his lap"
S: (n) arm (a human limb; technically the part of the superior limb between the shoulder and the elbow but commonly used to refer to the whole superior limb)
S: (n) cubitus (the arm from the elbow to the fingertips)
S: (n) forearm (the part of the superior limb between the elbow and the wrist)
S: (n) digit, dactyl (a finger or toe in human beings or corresponding body part in other vertebrates)
S: (n) minimus (the fifth digit; the little finger or little toe)