Bristle, a skin structure very similar to hair in its construction and development, but harder, thicker, and stiffer. Pig bristles are used for technical purposes. – In botany, the term bristle (seta) is used for the long and stiff hair-like trichomes on the epidermis of plants, as well as the stems of spore capsules of mosses and liverworts

Source: Meyers Großes Konversations-Lexikon, 6. Auflage 1905–1909

Military Glossary