'Horn' of a deer, often branched, and made of bone rather than horn. Antlers, unlike true horns, are shed and regrown each year. Reindeer of both sexes grow them, but in all other types of deer, only the males have antlers.

During growth the antler is covered by a sensitive, hairy skin, known as 'velvet', which dries up and is rubbed off when maturity is attained. The number and complexity of the branches increase year by year.