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-oma

plural -omas, -omata.
1.
a noun suffix used to form names of tumors, of the kind specified by the base:
fibroma; melanoma.
Origin
probably extracted from carcinoma or sarcoma
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for omata

-oma

combining form
1.
indicating a tumour: carcinoma
Word Origin
from Greek -ōma
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for omata

-oma

word-forming element, from Greek -oma, with lengthened stem vowel + -ma, suffix forming neuter nouns and nouns that indicate result of verbal action (equivalent of Latin -men); especially taken in medical use as "morbid growth, tumor," based on sarcoma, carcinoma.

Online Etymology Dictionary, © 2010 Douglas Harper
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omata in Medicine

-oma suff.
Tumor: lipoma.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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omata in Science
-oma  
A suffix meaning "tumor" or "cancer," as in carcinoma. Often, the suffix is added to the name of the affected body part, as in lymphoma, cancer of the lymph tissue.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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