adjective Also i·so·met·ri·cal.
  1. of, relating to, or having equality of measure.
  2. of or relating to isometric exercise.
  3. Crystallography. noting or pertaining to that system of crystallization that is characterized by three equal axes at right angles to one another.Compare crystal system.
  4. Prosody. of equal measure; made up of regular feet.
  5. Drafting. designating a method of projection (isometric projection) in which a three-dimensional object is represented by a drawing (i·somet·ric draw·ing) having the horizontal edges of the object drawn usually at a 30° angle and all verticals projected perpendicularly from a horizontal base, all lines being drawn to scale.Compare orthographic projection.
  1. isometrics, isometric exercise(def 1).
  2. an isometric drawing.
  3. Also called isometric line. Physics. isochore(def 1).

Origin of isometric

1830–40; < Greek isometr(ía) isometry + -ic
Related formsi·so·met·ri·cal·ly, adverbpseu·do·i·so·met·ric, adjectiveun·i·so·met·ri·cal, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for isometrics


  1. (functioning as singular) physical exercise involving isometric contraction of muscles


adjective Also: isometrical
  1. having equal dimensions or measurements
  2. physiol of or relating to muscular contraction that does not produce shortening of the muscle
  3. (of a crystal or system of crystallization) having three mutually perpendicular equal axes
  4. crystallog another word for cubic (def. 4)
  5. prosody having or made up of regular feet
  6. (of a method of projecting a drawing in three dimensions) having the three axes equally inclined and all lines drawn to scale
  1. Also called: isometric drawing a drawing made in this way
  2. Also called: isometric line a line on a graph showing variations of pressure with temperature at constant volume
Derived Formsisometrically, adverb

Word Origin for isometric

C19: from Greek isometria (see iso- + -metry) + -ic
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 isometrics

1962, American English, from isometric; also see -ics.



1838, literally "of the same measure," coined from Greek isos "equal" (see iso-) + metron "measure" (see meter (n.2)). Originally a method of using perspective in drawing; the physiological sense relating to muscular action is from 1891, from German isometrisch in this sense (1882).

Online Etymology Dictionary, © 2010 Douglas Harper

isometrics in Medicine


  1. Isometric exercise.


  1. Of or exhibiting equality in dimensions or measurements.
  2. Of, relating to, or being a crystal system of three equal axes lying at right angles to each other.
  3. Of or involving muscular contraction against resistance in which the length of the muscle remains the same.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

isometrics in Science


  1. See cubic.
  2. Of or involving muscular contraction against resistance in which the length of the muscle remains the same.
  3. A graph showing the relationship between two quantities, such as pressure and temperature, when a third quantity, such as volume, is held constant.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.