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From The Collaborative International Dictionary of English v.0.48:
kumquat \kum"quat\, n. [Chin. kin keu.] (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.] [1913 Webster + WordNet 1.5]