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exo- +‎ -gen: compare French exogène.


exogen (plural exogens)

  1. (botany) A plant characterized by wood, bark and pith, the wood forming a layer between the other two, and growth only occurring on the outside.
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Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for exogen in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)