1. 腹鳍:pelvic cavity 骨盆腔 | pelvic fin 腹鳍 | pelvic girdle 腰带;骨盆带
2. 腹:pelvic cavity 骨盆腔 | pelvic fin 腹 | pelvic girdle 腰带
noun
1. 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
Synonym: ventral fin