| mean corpuscular v. |
the average volume of erythrocytes, conventionally expressed in cubic micrometers or femtoliters per red cell, obtained by multiplying the hematocrit (in L/L) by 1000 and dividing by the red cell count (in millions per μL): MCV = Hct/RBC. Automated electronic blood cell counters generally obtain the MCV directly from the average pulse height of the voltage pulses produced during the red cell count. These instruments obtain the hematocrit indirectly from the equation Hct = MCV × RBC.
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| mean foundation p. |
the mean of the various irregularities in form and inclination of the basal seat (denture-supporting tissues). The ideal condition for denture stability exists when the mean foundation plane is most nearly at right angles to the direction of force.
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| mean l. |
the average time until decay for a sample of particles of a radionuclide or elementary particle, equal to the reciprocal of the decay constant or 1.443 times the half-life. Called also lifetime.
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| Mean's s. |
Kocher's s.
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| Means-Lerman s. |
a systolic grating sound heard in the second left intercostal space during exhalation in hypertension, caused by friction between the pleural and pericardial surfaces.
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