Per‐im″e‐ter (?), n. [Gr. �; � around + � measure: cf. F. 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.