a combining form meaning “breast,” used in the formation of compound words: mastopathy.
Also, especially before a vowel, mast-.

combining form representing Greek mastós breast Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
masto- or (before a vowel) mast-
combining form
indicating the breast, mammary glands, or something resembling a breast or nipple: mastodon; mastoid
[from Greek mastos breast]
mast- or (before a vowel) mast-
combining form
[from Greek mastos breast]

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

masto- or mast-
Breast; mammary gland; nipple: mastectomy.

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