cit·ron /ˈsɪtrən/
 香木緣,圓佛手柑,一種西瓜
 Cit·ron n.
 1. Bot A fruit resembling a lemon, but larger, and pleasantly aromatic; it is produced by the citron tree (Citrus medica).  The thick rind, when candied, is the citron of commerce.  The fruit was once called the lime.
 2. A citron tree, Citrus medica.
 3. A citron melon.
 Citron melon. (a) A small variety of muskmelon with sugary greenish flesh. (b) A small variety of watermelon, whose solid white flesh is used in making sweetmeats and preserves.
 Citron tree Bot., the tree which bears citrons.  It was probably a native of northern India, and is now understood to be the typical form of Citrus Medica.
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 citron
      n 1: large lemonlike fruit with thick aromatic rind; usually
           preserved
      2: thorny evergreen small tree or shrub of India widely
         cultivated for its large lemonlike fruits that have thick
         warty rind [syn: citron tree, Citrus medica]