Definition of calamondin in English:
 calamondin
(also calamondin orange)
nounˌkaləˈmɒndɪnˌkaləˈmändən
A small hybrid citrus plant which bears fragrant white flowers followed by small orange-yellow fruit, native to the Philippines and grown as a houseplant.
四季橘,唐金橘
× Citrofortunella microcarpa (formerly Citrus mitis), family Rutaceae
Example sentencesExamples
-  When and how do I trim my Meyer lemons and calamondin?
 -  Open the bottle, and one smells a mixed but light scent of different kinds of fruit including orange, citrus and calamondin orange.
 -  The miniature calamondin ‘orange’ grown as a decorative house plant is sometimes considered to be a mandarin × kumquat hybrid, and sometimes assigned to a species of its own.
 -  Examples of acidic varieties include ‘Improved Meyer’ and ‘Ponderosa’ lemons, calamondins, and kumquats.
 
Origin
Early 20th century: from Tagalog kalamunding.