Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Loss or lack of bodily strength; weakness; debility.
 
from The Century Dictionary.
- noun   In pathology, debility; want of strength. Also 
astheny . - noun [capitalized] In zoology, a genus of insects.
 
from the GNU version of the Collaborative International Dictionary of English.
- noun (Med.) Want or loss of strength; debility; diminution of the vital forces.
 
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun medicine  
weakness ; loss of strength 
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun an abnormal loss of strength
 
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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GUILLAIN-BARRE syndrome, asthenia, headache, sleepiness and pericardial effusion were reported as other important medical event.
Shelley Ross: What the Tea Party -- and Everyone Else -- Missed on Gardasil® Shelley Ross 2011
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One day post vaccination the patient developed asthenia, headache and sleepiness which improved the following day.
Shelley Ross: What the Tea Party -- and Everyone Else -- Missed on Gardasil® Shelley Ross 2011
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He died at the age of thirty-two from “asthenia from pneumonia,” probably as a secondary result of sickle cell disease.
The Edge of Evolution Michael J. Behe 2007
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He died at the age of thirty-two from “asthenia from pneumonia,” probably as a secondary result of sickle cell disease.
The Edge of Evolution Michael J. Behe 2007
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He died at the age of thirty-two from “asthenia from pneumonia,” probably as a secondary result of sickle cell disease.
The Edge of Evolution Michael J. Behe 2007
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He died at the age of thirty-two from “asthenia from pneumonia,” probably as a secondary result of sickle cell disease.
The Edge of Evolution Michael J. Behe 2007
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You -- you kind of worry that some measure of diffidence, or lack of interest, sets in, you know, kind of political asthenia.
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Evaluation of the efficacy of a standardized ginseng extract in patients with psychophysical asthenia and neurological disorders.
The Best Alternative Medicine Dr. Kenneth R. Pelletier 2000
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Evaluation of the efficacy of a standardized ginseng extract in patients with psychophysical asthenia and neurological disorders.
The Best Alternative Medicine Dr. Kenneth R. Pelletier 2000
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The patient died four years after manifesting symptoms of a general asthenia.
The Mad Among Us Gerald N. Grob 1994
 
chained_bear commented on the word asthenia
"'Strychnin sic in large doses hypodermically had a distinct value in the existing asthenia....'"
—John M. Barry, The Great Influenza (NY: Penguin Books, 2004), 358
February 17, 2009