exogeny

Noun

 * 1) Influence by external forces.
 * 2) Growth on the outside or near the surface.
 * 3)  A division of woody plants whose stem is formed by successive accretions to the outside of the wood under the bark
 * 4)  A phase in the life cycle of a hair follicle in which a hair exits the follicle.
 * 5)  Exogamy.