sclerophyllPronunciation: /ˈsklɪərəfɪl, ˈsklɛ-/Definition of sclerophyll noun Botany a woody plant with evergreen leaves that are tough and thick in order to reduce water loss. Derivatives sclerophyllousPronunciation: /-ˈrɒfɪləs/ adjective Origin: early 20th century: from Greek sklēros 'hard' + phullon 'leaf'sclerophyll in other Oxford dictionaries Definition of sclerophyll in the US English dictionary