Pathology. lack of tone or energy; muscular weakness, especially in a contractile organ.
Phonetics. lack of stress accent.
Also, atonia [uh-toh-nee-uh, ey-toh-] .

1685–95; < Late Latin atonia < Greek, derivative of átonos unaccented, languid, literally, toneless. See a-6, tone Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
atony (ˈætənɪ)
1.  pathol lack of normal tone or tension, as in muscles; abnormal relaxation of a muscle
2.  phonetics lack of stress or accent on a syllable or word
[C17: from Latin atonia, from Greek: tonelessness, from atonos slack, from a-1 + tonostone]

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American Heritage
Medical Dictionary

atony at·o·ny (āt'ə-nē, āt'n-ē) or a·to·ni·a (ā-tō'nē-ə)
Lack of normal tone or tension; flaccidity.

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