#outline  the line that appears to bound an object
  supertype:  #bounds__boundary  the line or plane indicating the limit or extent of something
  subtype:  #coastline  the outline of a coast
  subtype:  #silhouette  an outline of a solid object (as cast by its shadow)
  subtype:  #skyline  the outline of objects seen against the sky

No statement uses or specializes #outline; click here to add one.