mes·o·the·li·o·ma

[mez-uh-thee-lee-oh-muh, mes-, mee-zuh-, -suh-]
noun, plural mes·o·the·li·o·mas, mes·o·the·li·o·ma·ta [-muh-tuh] . Pathology.
a malignant tumor of the covering of the lung or the lining of the pleural and abdominal cavities, often associated with exposure to asbestos.

Origin:
1905–10; mesotheli(um) + -oma

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
mesothelioma (ˌmɛzəʊˌθiːlɪˈəʊmə) [Click for IPA pronunciation guide]
 
n , pl -mata, -mas
a tumour of the epithelium lining the lungs, abdomen, or heart: often associated with exposure to asbestos dust
 
[C20: from mesotheli(um) + -oma]

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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00:10
Mesothelioma has a plethora of syllables.
So is pneumonoultramicroscopicsilicovolcanoconiosis. Does it mean:
(used as a nonsense word by children to express approval or to represent the longest word in English.)
an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.
American Heritage
Medical Dictionary

mesothelioma mes·o·the·li·o·ma (měz'ə-thē'lē-ō'mə, měs'-)
n. pl. mes·o·the·li·o·mas or mes·o·the·li·o·ma·ta (-mə-tə)
A rare neoplasm derived from the lining cells of the pleura and peritoneum and growing as a thick sheet composed of spindle cells or fibrous tissue covering the viscera.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Results from clinical trials concerning mesothelioma.
Most workers who contracted serious illnesses-lung diseases and mesothelioma, a painful form of cancer-have died.
But the long lag between exposure and the development of mesothelioma means that the number of cases is still rising.
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