plesiosaurus /,pli:siә'sɔ:rәs/ 📖 中文释义 n. <古生>蛇颈龙 📘 English Definition(英文释义) n extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous ← plesiosaurs plesiostratotype →