Longman Dictionary English From Longman Dictionary of Contemporary EnglishRelated topics: Plantssepalsep‧al /ˈsepəl $ ˈsiː-/ noun [countable] technical HBPone of the small leaves directly under a flowerOrigin sepal (1800-1900) Modern Latin sepalum, from sepa- (from Greek skepe “covering”) + -lum (as in petalum “petal”) ldoceonline.com