circumference (n.)
- ambit
- annulus
- areola
- aureole
- border
- boundaries
- boundary
- bounds
- chaplet
- circle
- circuit
- circumscription
- circus
- compass
- confines
- corona
- coronet
- cortex
- covering
- crown
- crust
- cycle
- diadem
- discus
- disk
- envelope
- epidermis
- exterior
- external
- facade
- face
- facet
- fringe
- front
- garland
- glory
- halo
- integument
- lasso
- limitations
- limits
- loop
- marches
- margin
- noose
- orbit
- outline
- outside
- outskirts
- pale
- perimeter
- periphery
- radius
- rim
- rind
- ring
- round
- roundel
- saucer
- shell
- skin
- skirts
- sphincter
- superficies
- superstratum
- surface
- top
- wheel
- wreath