a combining form with the meanings “large, great, grand,” “abnormally large,” used in the formation of compound words: megalopolis; megalocardia.
Also, especially before a vowel, megal-.
Compare mega-.

< Greek, combining form of megal- (stem of mégas) great, large Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
megalo- or (before a vowel) megal-
combining form
indicating greatness, or abnormal size: megalopolis; megaloblast
[from Greek megas great]
megal- or (before a vowel) megal-
combining form
[from Greek megas great]

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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American Heritage
Medical Dictionary

megalo- or megal-
Large; of exaggerated size or greatness: megalocephaly.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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