Etymology
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isometric (adj.)

1838, literally "of the same measure," from iso- "the same, equal" + -metric. The components are Greek: isos "equal, identical" + metron "a measure." Originally a method of using perspective in drawing; later in reference to crystals. The physiological sense relating to muscular action is from 1889, from German isometrisch in this sense (1882).

updated on January 13, 2016

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Definitions of isometric from WordNet
1
isometric (adj.)
related by an isometry;
isometric (adj.)
of or involving muscular contraction in which tension increases while length remains constant;
isometric (adj.)
having equal dimensions or measurements;
Synonyms: isometrical
isometric (adj.)
of a crystal system characterized by three equal axes at right angles;
2
isometric (n.)
a line connecting isometric points;
Synonyms: isometric line
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.