callalooPronunciation: /ˌkaləˈluː/ (also callalou)Definition of callaloo noun 1 [mass noun] the spinach-like leaves of a tropical American plant, used in Caribbean cookery. a soup or stew made with callaloo leaves: I served it with rice and callalou 2the plant of the arum family from which callaloo leaves are obtained. Genus Xanthosoma, family Araceae Origin: mid 18th century: from American Spanish calalúcallaloo in other Oxford dictionaries Definition of callaloo in the US English dictionary