Definition of mm

mm: Abbreviation for millimeters. For example, mm Hg means millimeters of mercury, the height of a column of mercury, as in a blood pressure reading.

(In upper-case letters, MM stands for meningomyelocele, malignant melanoma, and multiple myeloma.)


Last Editorial Review: 10/9/2012

Search MedTerms:


Back to MedTerms online medical dictionary A-Z List
Pill Identifier Tool

Need help identifying pills and medications?
Use the pill finder tool on RxList.