From Longman Dictionary of Contemporary Englishbell pepperˈbell ˌpepper noun [countable] 
American EnglishDF a hollow red, green, or yellow vegetable SYN pepper British English
American EnglishDF a hollow red, green, or yellow vegetable SYN pepper British EnglishExamples from the Corpus
bell pepper• Add onion, carrot, and bell pepper and cook, covered, until tender, about 5 minutes.• Stir in the onions, celery, bell pepper and garlic. 