perimeter

[ puh-rim-i-ter ]
/ pəˈrɪm ɪ tər /

noun

the border or outer boundary of a two-dimensional figure.
the length of such a boundary.
a line bounding or marking off an area.
the outermost limits.
Military. a fortified boundary that protects a troop position.
Ophthalmology. an instrument for determining the peripheral field of vision.

Origin of perimeter

1585–95; < French périmètre < Latin perimetros (feminine) < Greek perímetron (neuter). See peri-, -meter

Related forms

pe·rim·e·ter·less, adjectivepe·rim·e·tral, per·i·met·ric [per-uh-me-trik] /ˌpɛr əˈmɛ trɪk/, per·i·met·ri·cal, adjectiveper·i·met·ri·cal·ly, adverbpe·rim·e·try, noun

Can be confused

parameter perimeter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for perimetry

perimeter

/ (pəˈrɪmɪtə) /

noun

maths
  1. the curve or line enclosing a plane area
  2. the length of this curve or line
  1. any boundary around something, such as a field
  2. (as modifier)a perimeter fence; a perimeter patrol
a medical instrument for measuring the limits of the field of vision

Derived Forms

perimetric (ˌpɛrɪˈmɛtrɪk) or perimetrical, adjectiveperimetrically, adverbperimetry, noun

Word Origin for perimeter

C16: from French périmètre, from Latin perimetros; see peri-, -meter
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for perimetry (1 of 2)

perimetry

[ pə-rĭmĭ-trē ]

n.

The determination of the limits of the visual field.

Medicine definitions for perimetry (2 of 2)

perimeter

[ pə-rĭmĭ-tər ]

n.

The outer limits of an area; circumference.
An instrument used to measure field of vision.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for perimetry

perimeter

[ pə-rĭmĭ-tər ]

The sum of the lengths of the segments that form the sides of a polygon.
The total length of any closed curve, such as the circumference of a circle.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.