B1
an intelligent animal that lives in the sea, breathes air and looks like a large, smooth, gray fish
Dictionary examples:
The dolphin applied for a job as a swimming instructor but was too overqualified. (0.0)
The dolphin tried to explain Wi-Fi to a confused shark using bubbles. (0.0)
The dolphin tried to teach fish how to breathe air, but they weren't interested. (0.0)
They swam with dolphins on holiday. (19.4)