Definition of "exogen" []

• A plant characterized by wood, bark and pith, the wood forming a layer between the other two, and growth only occurring on the outside. (noun)

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• "Smilax belongs to a transition class, partaking somewhat of the nature of endogen and of exogen."
• "The former sees a tree in all its glory, where the latter sees an exogen with a pair of cotyledons."
• "Standardmetoden i forskningen är att hitta någon exogen källa till variation i mängden bistånd som olika länder får: Ett så kallat instrument för bistånd."