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perimeter

[puh-rim-i-ter]
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noun
  1. the border or outer boundary of a two-dimensional figure.
  2. the length of such a boundary.
  3. a line bounding or marking off an area.
  4. the outermost limits.
  5. Military. a fortified boundary that protects a troop position.
  6. Ophthalmology. an instrument for determining the peripheral field of vision.
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Origin of perimeter

1585–95; < French périmètre < Latin perimetros (feminine) < Greek perímetron (neuter). See peri-, -meter
Related formspe·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 confusedparameter perimeter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for perimetrical

perimeter

noun
  1. 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
  2. a medical instrument for measuring the limits of the field of vision
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Derived Formsperimetric (ˌpɛrɪˈmɛtrɪk) or perimetrical, adjectiveperimetrically, adverbperimetry, noun

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 perimetrical

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

perimetrical in Medicine

perimeter

(pə-rĭmĭ-tər)
n.
  1. The outer limits of an area; circumference.
  2. 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.

perimetrical in Science

perimeter

[pə-rĭmĭ-tər]
  1. The sum of the lengths of the segments that form the sides of a polygon.
  2. 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.