From Longman Dictionary of Contemporary Englishpenguinpen‧guin /ˈpeŋɡwɪn/ ●●○ noun [countable] 
HBBa large black and white Antarctic sea bird, which cannot fly but uses its wings for swimming
HBBa large black and white Antarctic sea bird, which cannot fly but uses its wings for swimmingExamples from the Corpus
penguin• Well, maybe more like confused penguins.• Emperor penguin chicks have a grayish down coat with dark wing and tail feathers, but this odd bird is all white.• In summer petrels nest in crevices in the rocks, and colonies of penguins breed on nearby islands.• Even the marching mob of penguins in Batman Returns were flocked by Reynolds's algorithms.• Although the paintings are genuinely of Palaeolithic age, they do not represent penguins.• The penguin presses the pants into service for a dastardly diamond heist.• I thought you guys all wore those penguin coats.PenguinPenguin trademark a type of paperback book produced by Penguin Books, which was the first British company to sell good books as paperbacks at a reasonable price. Penguin is the best known name in paperbacks in the UK.Origin penguin (1500-1600) Perhaps from Welsh pen gwyn “white head” 