One of the hard, usually permanent structures projecting from the head of certain mammals, such as cattle, sheep, goats, or antelopes, consisting of a bony core covered with a sheath of keratinous material.

• 角生长于某些哺乳动物（例如牛、绵羊、山羊或羚羊）头上的坚硬的，通常为永久性的结构，其以骨质结构为中心，外覆一层角质物