isotonic definition | Dictionary.com

i⋅so⋅ton⋅ic

[ahy-suh-ton-ik]

–adjective

1.	Also, isosmotic. Physical Chemistry. noting or pertaining to solutions characterized by equal osmotic pressure. Compare hypertonic (def. 2), hypotonic (def. 2).

Physiology.

a.	noting or pertaining to a solution containing the same salt concentration as mammalian blood.

b.	noting or pertaining to a muscular contraction in which constant tension continues while the length of the muscle decreases, as during mechanical work.

3.	Music. of or characterized by equal tones.

Origin:
1820–30; < Gk isóton(os) having equal accent or tone (see iso-, tone ) + -ic

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
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i·so·ton·ic (ī'sə-tŏn'ĭk) Pronunciation Key
adj.

Of equal tension.
Isosmotic.
Having the same concentration of solutes as the blood: an isotonic saline solution.
Physiology Of or involving muscular contraction in which the muscle remains under relatively constant tension while its length changes.

[iso- + Greek tonos, tension; see tone + -ic.]

i'so·ton'i·cal·ly adv., i'so·to·nic'i·ty (-tə-nĭs'ĭ-tē) n.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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isotonic
adjective
1.	(used of solutions) having the same or equal osmotic pressure [ant: hypertonic, hypotonic]
2.	relating to or characterized by the equal intervals of a musical scale; "isotonic tuning"
3.	of or involving muscular contraction in which tension is constant while length changes [ant: isometric]
4.	of two or more muscles; having equal tension