Definition of Pickwickian syndrome

Pickwickian syndrome: The combination of obesity, somnolence (sleepiness), hypoventilation (underbreathing), and plethoric (red) face.

The syndrome is so named because of the "fat and red-faced boy in a state of somnolency" that Charles Dickens described in his novel, The Pickwick Papers. (The same boy is thought by some experts possibly to have had the Prader-Willi syndrome).