Pronunciation: (oul),[key] —n. 1. any of numerous, chiefly nocturnal birds of prey, of the order Strigiformes, having a broad head with large, forward-directed eyes that are usually surrounded by disks of modified feathers: many populations are diminishing owing to loss of habitat.
2. one of a breed of domestic pigeons having an owllike appearance.
3. See night owl. 4. a person of owllike solemnity or appearance.
—adj. operating late at night or all night: an owl train.