scle·ro·phyll I. \ˈ ̷ ̷rəˌfil\adjective orscle·ro·phyl·lous\| ̷ ̷ ̷ ̷|filəs\ Etymology: International Scientific Vocabulary scler- + -phyll or -phyllous 1.: of, relating to, or exhibiting sclerophylly < sclerophyll plants > < sclerophyll characteristics > 2.: made up of sclerophyll plants < a sclerophyll scrub > II. noun (-s) : a sclerophyll plant