penguin

noun5

1. •
   Any of several flightless sea birds, of the family Spheniscidae within the order Sphenisciformes, found in the Southern Hemisphere, marked by their usual upright stance, walking on short legs, and (generally) their stark black and white plumage.

   • Here are also birds cal'd Pen-gwins (white-head in Welch) like Pigmies walking upright, their finns or wings hanging very orderly downe like sleeves […] — 1638
2. •
   (slang) A nun.
3. •
   (UK, slang) A member of the air force who does not fly aircraft.

   • She may have been a “penguin”—an Air Force service member who didn't fly—but it sure beat being at home, as Brady had pointed out. — 2015
4. •
   A type of catch where the palm of the hand is facing towards the leg with the arm stretched downward, resembling the flipper of a penguin.
5. •
   (no longer used, historical) An auk (sometimes especially a great auk), a bird of the Northern Hemisphere.

   • This last species of penguin, or auk, seems to be the same with the alca cirrhata of Dr. Pallis, Spicileg. Zool. Fasc. v. p. 7. tab. i. & v. fig. 1–3. F. — 1772