noun Physiology.
a normal state of continuous slight tension in muscle tissue that facilitates its response to stimulation.

1875–80; < Neo-Latin, special use of Latin tonus < Greek tónos tone Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tonus (ˈtəʊnəs)
physiol the normal tension of a muscle at rest; tone
[C19: from Latin, from Greek tonostone]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

tonus to·nus (tō'nəs)
Body or muscular tone; tonicity.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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