| Noun | 1. | cob - nut of any of several trees of the genus Corylusedible nut - a hard-shelled seed consisting of an edible kernel or meat enclosed in a woody or leathery shell hazelnut, hazelnut tree, hazel - any of several shrubs or small trees of the genus Corylus bearing edible nuts enclosed in a leafy husk | |
| 2. | cob - stocky short-legged harness horse | |
| 3. | cob - white gull having a black back and wings | |
| 4. | cob - adult male swanswan - stately heavy-bodied aquatic bird with very long neck and usually white plumage as adult | |