Any of several flightless sea birds, of 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.

plural of penguin

(UK, aviation, historical) A machine resembling an aeroplane but unable to fly, used for training pilots.

plural of penguin trainer

(physics) A type of unicyclic Feynman diagram in which a quark temporarily changes flavor and engages in an interaction.

The largest of penguins (Aptenodytes forsteri), that inhabits Antarctica.

a large penguin, Aptenodytes patagonicus, that lives on the coast of Antarctica and nearby islands

(informal) A tuxedo. / (historical) A kind of spacesuit worn by Soviet cosmonauts.

plural of penguin suit

A species of penguin, Pygoscelis antarcticus, with a distinctive black strip under the head.