KUMQUAT
kumquat
(noun) small oval citrus fruit with thin sweet rind and very acid pulp
kumquat, cumquat, kumquat tree
(noun) any of several trees or shrubs of the genus Fortunella bearing small orange-colored edible fruits with thick sweet-flavored skin and sour pulp
Source: WordNet® 3.1
Etymology
Noun
kumquat (plural kumquats)
A small, orange citrus-like fruit which is native to Asia (Citrus japonica, syn. Fortunella japonica).
Source: Wiktionary
Kum"quat, n. Etym: [Chin. kin keu.] (Bot.)
Definition: A small tree of the genus Citrus (C. Japonica) growing in China
and Japan; also, its small acid, orange-colored fruit used for
preserves.
Source: Webster’s Unabridged Dictionary 1913 Edition