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Synonyms for Witloof (same or very similar meaning)

WordNet sense 1 (widely cultivated herb with leaves valued as salad green; either curly serrated leaves or broad flat ones that are usually blanched):
endive, Cichorium endivia

WordNet sense 2 (young broad-leaved endive plant deprived of light to form a narrow whitish head):
Belgian endive, French endive

From the ODE community, based on WordNetadd/edit