ventral fin
1. 腹鳍：ventilator 通风器 | ventral fin 腹鳍 | ventral 腹的
2. 腹：ventral 腹的 | ventral fin 腹 | ventral nerve chain 腹神经节链
3. 臀鳍;腹鳍：variety 变种 | ventral fin 臀鳍;腹鳍 | vertical current 垂直流
4. 腹翅：ventilation garment 通风服 | ventral fin 腹翅 | ventral gun turret 机腹炮塔
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: pelvic fin