circumference
noun
[ səˈkʌmf(ə)r(ə)ns ]
• the enclosing boundary of a curved geometric figure, especially a circle.
Similar:
perimeter,
border,
boundary,
edge,
rim,
verge,
margin,
outline,
fringe,
bounds,
limits,
extremity,
confines,
marge,
bourn,
skirt,
Origin:
late Middle English: from Old French circonference, from Latin circumferentia, from circum ‘around, about’ + ferre ‘carry, bear’.