co·chin \ˈkōchə̇n, ˈkäch-\noun (-s) Etymology: from Cochin China, a region of Vietnam 1.orcochin chinaoften Cochin & usually Cochin China: a large domestic fowl of an Asian breed having soft thick plumage of white, black, buff, or partridge, small wings and tail, and densely feathered legs and feet 2.: argus brown