kum·quat /ˈkʌmˌkwɑt/
  金橘
  kum·quat n.  Bot. any of several trees or shrubs of the genus Fortunella (formerly Citrus) of the rue family (Rutaceae) (especially Citrus Japonica) growing in China and Japan bearing small orange-colored edible fruits with thick sweet-flavored skin and sour pulp; also, any of the small acid, orange-colored citrus fruits of such plants, used mostly for preserves.  [Also spelled cumquat.]
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  kumquat
       n 1: any of several trees or shrubs of the genus Fortunella
            bearing small orange-colored edible fruits with thick
            sweet-flavored skin and sour pulp [syn: cumquat, kumquat
            tree]
       2: small oval citrus fruit with thin sweet rind and very acid
          pulp