kumquatPronunciation: /ˈkʌmkwɒt/ (also cumquat)Definition of kumquat noun 1an orange-like fruit related to the citruses, with an edible sweet rind and acid pulp. 2the East Asian shrub or small tree which yields the kumquat. Genus Fortunella, family Rutaceae Origin: late 17th century: from Chinese (Cantonese dialect) kam kwat 'little orange'kumquat in other Oxford dictionaries Definition of kumquat in the US English dictionary