seta

A stiff hair, bristle, or bristlelike process or part on an organism, especially an invertebrate.

The stalk of a moss or liverwort capsule.

In zoology and anatomy, a bristle; a chæta; a stiff, stout hair; a fine, slender spine or prickle; any setaceous appendage.

In botany, a bristle of any sort; a stiff hair; a slender, straight prickle; also, the stalk that supports the theca, capsule, or sporangium of mosses.

Any slender, more or less rigid, bristlelike organ or part; as the hairs of a caterpillar, the slender spines of a crustacean, the hairlike processes of a protozoan, the bristles or stiff hairs on the leaves of some plants, or the pedicel of the capsule of a moss.