LONGAN Meaning of LONGAN in English [ 'lɒŋg(ə)n ]■ noun an edible juicy fruit from a SE Asian plant ( Dimocarpus ~ ) related to the lychee.OriginC18: from Chin. lóngyǎn , lit. 'dragon's eye'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004