2. Noun. Growth on the outside or near the surface. ¹
3. Noun. (botany) A division of woody plants whose stem is formed by successive accretions to the outside of the wood under the bark ¹
4. Noun. (anatomy) A phase in the life cycle of a hair follicle in which a hair exits the follicle. ¹
5. Noun. (anthropology) Exogamy. ¹
¹ Source: wiktionary.com