Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A toxic condition marked by diarrhea, elevated blood pressure, rapid breathing, heart palpitations, and insomnia, caused by excessive ingestion of coffee and other caffeine-containing substances.
from The Century Dictionary.
- noun A morbid state produced by prolonged or excessive use of caffein.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun   a toxic condition caused byexcessive ingestion ofcoffee and othercaffeine -containing beverages 
- noun   addiction to such beverages
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun poisoning resulting from excessive intake of caffeine containing products
Etymologies
Sorry, no etymologies found.
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Examples
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								I discover later that I am suffering from the effects of "caffeinism" - a withdrawal from caffeine. Evening Standard - Home Richard Godwin 2011 
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								But overuse can develop into "caffeinism," which may cause muscle twitching, insomnia, headaches and heart palpitations. 
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								But overuse can develop into "caffeinism," which may cause muscle twitching, insomnia, headaches and heart palpitations. 
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								Looks like cold turkey is the best way to beat caffeinism. paqman Beat Caffeine Addiction, Then Stay Awake With Placebos | Lifehacker Australia 2009 
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								Looks like cold turkey is the best way to beat caffeinism. Beat Caffeine Addiction, Then Stay Awake With Placebos | Lifehacker Australia 2009 
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								Ad lib caffeine consumption, symptoms of caffeinism, and academic performance. The UltraMind Solution M.D. Mark Hyman 2009 
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								Caffeine is a drug that in large amounts, especially over an extended period of time, can lead to a condition termed "caffeinism." Evil Caffeine! 2006 
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								Caffeine is a drug that in large amounts, especially over an extended period of time, can lead to a condition termed "caffeinism." Archive 2006-12-01 2006 
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								Launched in 2002 by the Caffeine Awareness Alliance, the campaign calls attention to the risks associated with caffeinism and caffeine withdrawal syndrome, a disorder recognized by the psychiatric community. PR.com Press Releases National Caffeine Awareness Month 2010 
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								All a psychiatrist need do is pick one or more conditions that seem to fit from the psychiatric "bible," the DSM manual, where hundreds of so-called "diagnosable conditions" are listed - everything from insomnia, worry, and caffeinism, to being shy. Home [Your Name Here] 2010 
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