di·cot·y·le·don /ˌdaɪˌkɑtḷˈidṇ/
  雙子葉植物
  di·cot·y·le·don n.  Bot. A plant whose seeds divide into two seed lobes, or cotyledons, in germinating.
  Syn: -- dicot, dicotyl.
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  dicotyledon
       n : flowering plant with two cotyledons; the stem grows by
           deposit on its outside [syn: dicot, magnoliopsid, exogen]