cacuminous,a.rare.|kəˈkjuːmɪnəs| [f. L. cacūmen, -ūminis a tree-top.] Of a tree: Having a pyramidal top. 1871M. Collins Inn Str. Meetings 10 Hours Of youth..and love 'neath trees cacuminous.a1879― in Pen Sketches I. 248 Luminous books (not voluminous) To read under beech-trees cacuminous.