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.
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