If something adorns a place or an object, it makes it look more beautiful. His watercolour designs adorn a wide range of books = decorate. to decorate something adorn sth with sth (adorner, from adornare, from ad- + ornare )
[ &-'dorn ] (transitive verb.) 14th century. Middle English, from Middle French adorner, from Latin adornare, from ad- + ornare to furnish; more at ORNATE.