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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.)

Source: MedTerms™ Medical Dictionary
Last Editorial Review: 10/9/2012

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