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]