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tono-

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  1. a combining form with the meanings “stretching,” “tension,” “tone,” used in the formation of compound words: tonometer.
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Origin of tono-

< Greek tón(os) (see tone) + -o-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

tono- in Medicine

tono-

pref.
  1. Tone; tension; pressure:tonography.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.