Sideburns

Sideburns, sideboards, or side whiskers are patches of facial hair grown on the sides of the face, extending from the hairline to below the ears. The term sideburns is a 19th-century corruption of the original burnsides, named after American Civil War general Ambrose Burnside, a man known for his unusual facial hairstyle that connected thick sideburns by way of a moustache, but left the chin clean-shaven.

Sideburns can be worn and grown in combination with other styles of facial hair, such as the moustache or goatee, but once they extend from ear to ear via the chin they cease to be sideburns and become a beard, chinstrap beard, or chin curtain. Indigenous men of Mexico, who shaved their heads and wore their sideburns long, as well as Colombians, who wear their sideburns long and typically do not have any other facial hair, are said to be wearing "balcarrotas", rarely seen in modern times, but prized in the sixteenth century as a mark of virile vanity and banned by the colonial authorities in New Spain, occasioning rioting in 1692.

In ancient history, Alexander the Great is depicted with sideburns in a mosaic from Pompeii.

Following the eighteenth century, when European men west of Poland were universally clean-shaven, sideburns, like beards, began to increase in popularity during the Napoleonic period, as first among military men; the trend eventually made its way to Meiji Japan, in the first wave of Western fashion there. The return of facial hair in Western Europe began as a military fashion, at first inspired by the heroic sideburns sported by hussar regiments.

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Wikipedia