From HomoExcelsior

1. A small nipplelike projection, such as a protuberance on the skin, at the root of a hair or feather, or at the base of a developing tooth. 2. One of the small, round or cone-shaped protuberances on the top of the tongue that contain taste buds. 3. A pimple or pustule. 4. A minute projection on the surface of a stigma, petal, or leaf.

---