Perimeter, n.
Etymology: [Gr. périmètre.]
1. (Geom.)
The outer boundary of a body or figure, or the sum of all the sides.
2. An instrument for determining the extent and shape of the field of vision.
Shades of meaning
Fernald lists perimeter only as an antonym, under center.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given