# perimeter

[puh-rim-i-ter]

- 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.

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## Origin of perimeter^{}

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Related Words

boundary, edge, periphery, confines, fringe, ambit, brim, borderline, skirt, circuit, limit, verge, compass, hem, margin, brink, outline## Examples from the Web for perimeter

### Contemporary Examples

#### Outside the lodge, running along its perimeter, was a small ditch lined by posts topped by a chest-high wooden beam.

#### SWAT teams moved in and tear gas canisters were heard from the perimeter of what had essentially become a militarized zone.

#### On Wednesday night, as the main stage acts raged, Capt. Chris Slayman cruised the perimeter of the Gathering.

#### When the Stalwart vanguard reached the perimeter, their ranks broke in confusion.

#### A couple more peer through spy holes in the sandbag barricades that line the perimeter.

### Historical Examples

#### There were guards surrounding the perimeter with radar search beams.

A Spaceship Named McGuireGordon Randall Garrett

#### Also, the lowest part of the perimeter of a geometrical figure.

The Sailor's Word-BookWilliam Henry Smyth

#### The Radius is a right line drawne from the center to the perimeter.

The Way To GeometryPeter Ramus

#### But that multiplication, is a multiplication of the Perpendicular by the Perimeter or bout-line.

The Way To GeometryPeter Ramus

#### The perimeter of a figure is the outer boundary or measure around it.

OrthographyElmer W. Cavins

## perimeter

- maths
- the curve or line enclosing a plane area
- the length of this curve or line

- any boundary around something, such as a field
- (as modifier)a perimeter fence; a perimeter patrol

- a medical instrument for measuring the limits of the field of vision

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## Word Origin

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

## Word Origin and History for perimeter

Online Etymology Dictionary, © 2010 Douglas Harper

## perimeter

(pə-rĭm′ĭ-tər)- The outer limits of an area; circumference.
- An instrument used to measure field of vision.

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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

## perimeter

[pə-rĭm′ĭ-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.

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The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.