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1. Oxford Dictionary

   secondary thickening

   • n.
     (in the stem or root of a woody plant) the increase in girth resulting from the formation of new woody tissue by the cambium.

   • noun: secondary thickening

2. • 更多解釋

   secondary thickening

   • IPA[ˈsekənˌderē ˈTHik(ə)niNG]

   • n.
     (in the stem or root of a woody plant) the increase in girth resulting from the formation of ...

   Oxford American Dictionary