Median diameter
From Coastal Wiki
Definition of Median diameter:
The median diameter of the sand fraction (defined as the fraction between 63 micron and 2 mm), is the midpoint of the grain-size distribution: 50% (by weight) of the sediment is coarser and 50% is finer than the median grain size.
This is the common definition for Median diameter, other definitions can be discussed in the article
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