a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S.

the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).

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Collins

World English Dictionary

fibromyalgia (ˌfaɪbrəʊmaɪˈældʒɪə)

—n
	a rheumatoid disorder characterized by muscle pain and headaches

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline

Word Origin & History

fibromyalgia

1981, said to have been coined by U.S. rheumatologist Mohammed Yunus, from L. fibra (see fiber) + Gk. mys (gen. myos) "muscle" (see muscle) + -algia. The earlier name for the condition was fibrositis.

Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage

Medical Dictionary

fibromyalgia fi·bro·my·al·gi·a (fī'brō-mī-āl'jē-ə, -jə)
n.
A syndrome characterized by chronic pain in the muscles of soft tissues surrounding joints, fatigue, and tenderness at specific sites in the body. Also called fibromyositis, fibrositis.

American Heritage

Science Dictionary

fibromyalgia

(fī'brō-mī-āl'jə) Pronunciation Key
A syndrome characterized by chronic pain in any of various muscles and surrounding soft tissues (such as tendons and ligaments), point tenderness at specific sites in the body, and fatigue. Inflammation is absent, and the cause is unknown.

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fibromyalgia

fi·bro·my·al·gia