noun

(1) Either of two large northern marine mammals having ivory tusks and tough hide over thick blubber,small fish with horselike heads bent sharply downward and curled tails,swim in upright position

(2) Either of two large northern marine mammals having ivory tusks and tough hide over thick blubber

(3) Small fish with horselike heads bent sharply downward and curled tails

(4) Swim in upright position