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 , adjective pe·rim·e·tral , per·i·met·ric [per-uh -me -trik] /ˌpɛr əˈmɛ trɪk/ , per·i·met·ri·cal , adjective per·i·met·ri·cal·ly , adverb pe·rim·e·try , noun Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for perimeter 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 of perimeter 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 of perimeter There were guards surrounding the perimeter with radar search beams.

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

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

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

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

British Dictionary definitions for perimeter noun 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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Derived Forms perimetric (ˌpɛrɪˈmɛtrɪk ) or perimetrical , adjective perimetrically , adverb perimetry , 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

Word Origin and History for perimeter n. early 15c., "line around a figure or surface," from Latin perimetros , from Greek perimetron "circumference," from peri- "around" (see peri- ) + metron "measure" (see meter (n.2)). Military sense of "boundary of a defended position" is attested from 1943.

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Online Etymology Dictionary, © 2010 Douglas Harper

n. 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.

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.