achene /əˈkin/
  瘦果
  A·chene A·che·ni·um n.  Bot. A small, dry, indehiscent fruit, containing a single seed, as in the buttercup; -- called a naked seed by the earlier botanists. [Written also akene and achænium.]
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  achene
       n : small dry indehiscent fruit with the seed distinct from the
           fruit wall