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a combining form with the meaning “muscle tension, nerve tension,” as specified by the initial element (hypertonia); used also in the formation of words that denote more generally a personality type or personality disorder (catatonia; somatotonia).
Origin of -tonia
see tone, -ia Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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-tonia in Medicine

-tonia suff.
Degree or state of tonicity: myotonia.

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