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mammo-

word-forming element meaning "breast," from Latin mamma "breast" (see mammal).

Online Etymology Dictionary, © 2010 Douglas Harper

mammo- in Medicine

mammo-

pref.
  1. Breast; mammary gland:mammogram.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.