The term 'curly-leafed vegetable' can be summarized by the crossword solution of KALE, which is a four-letter word. KALE is a leafy green vegetable that belongs to the Brassica family, which also includes cabbage, broccoli, and Brussels sprouts. It is known for its curly leaves and is a popular ingredient in salads, soups, and other dishes. KALE is a nutrient-dense food, containing high levels of vitamins A, C, and K, as well as calcium and iron.