mass median aerodynamic diameter

Also found in: Acronyms.

mass me·di·an ae·ro·dy·nam·ic di·am·e·ter

(MMAD) (mas mē'dē-ăn ār'ō-dī-nam'ik dī-am'ĕ-tĕr)
The geometric mean of the aerodynamic diameters of a given sample of inhaled particles.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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In the present study, we used synthetic 1-[micro]m carbon and carbon/iron particulates, designed to simulate environmental particulates of mass median aerodynamic diameter [less than or equal to] 2.5 [micro]m (P[M.sub.2.5]) that occur as airborne pollution.
The large particles [3.1 [micro]m mass median aerodynamic diameter (MMAD)] were collected on the cover slips and showed 13% variability.