isotonic

adjective

iso·ton·ic | \ ˌī-sə-ˈtä-nik

Definition of isotonic

1 : of, relating to, or being muscular contraction in the absence of significant resistance, with marked shortening of muscle fibers, and without great increase in muscle tone — compare isometric

2 : isosmotic —used of solutions

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His parents, Paul and Brigitte, a medical physicist, and girlfriend, Nina Almer, are the ones who will drive behind with food supplies, isotonic drinks, spare wheels and, of course, his MP3 players. — Aimee Lewis, CNN, "Extreme Cuba: 1,450 kilometers in 57 hours on two wheels ... listening to one song on repeat," 18 July 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'isotonic.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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The first known use of isotonic was in 1891

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isotonic

adjective

iso·ton·ic | \ ˌī-sə-ˈtän-ik

Medical Definition of isotonic

1 : of, relating to, or exhibiting equal osmotic pressure isotonic solutions — compare hypertonic sense 2, hypotonic sense 2

2 : of, relating to, or being muscular contraction in the absence of significant resistance, with marked shortening of muscle fibers, and without great increase in muscle tone — compare isometric sense 2