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tono-

1.
a combining form with the meanings “stretching,” “tension,” “tone,” used in the formation of compound words:
tonometer.
Origin
< Greek tón(os) (see tone) + -o-
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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tono- in Medicine

tono- pref.
Tone; tension; pressure: tonography.

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