callaloo Syllabification: (cal·la·loo)Pronunciation: /ˌkaləˈlo͞o, ˈkaləˌlo͞o/ (also callalou)Definition of callaloo noun 1the spinachlike leaves of a tropical American plant, widely used in Caribbean cooking. a soup or stew made with callaloo leaves. 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 British & World English dictionary