Kumquat n. : A small tree of the genus Citrus (C. Japonica) growing in China and Japan; also, its small acid, orange-colored fruit used for preserves.

Example:
How do I plant Kumquat seeds so they will grow healthily?

Taxonomy
Kumquat, fruit, kumquat fruit, kumquat trees, orange, unranked, rind, kumquat tree, free encyclopedia, Citrus, juice, cross, genus Fortunella, genus Citrus, citrus fruits, family, edible fruit, trees.

Defination from the web:
kumquat requires a hot summer, ranging from 25°C to 38°C (77° to 100°F), but can withstand frost down to about 10 °C (14.0 °F) without injury. ... The late 2000s also saw the emergence of the word 'Kumquat' as a derogatory term (used to describe a clumsy or dolt-like person, usually ...