Definition of "exogeny" []

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

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• "Turanian, and a highly gifted sketch of the main phases of human evolution; to MacLennan -- the law of exogeny; and to Fison and"