Category: M

  • Myopic crescent

    A grayish patch around the optic disk in the fundus of the eye caused by atrophy of the choroid.  

  • Muscle cramp

    A painful, involuntary skeletal muscle contraction. This may occur at rest or during exercise, is asymmetrical, and usually affects the gastrocnemius muscle and small muscles of the foot. Ordinary muscle cramps are not due to fluid or electrolyte abnormality. These cramps begin when a muscle already in its most shortened position involuntarily contracts. Painful involuntary…

  • Moist cough

    A loose cough accompanied by production of mucus or exudate.  

  • Milk corpuscle

    A fat-filled globule present in milk. It represents the distal end of a mammary gland cell broken off in apocrine secretion.  

  • Marginal convolution

    The fold on the medial surface of the frontal lobe, adjacent to the longitudinal fissure.  

  • Membranous conjunctivitis

    Acute conjunctivitis marked by a false membrane with or without infiltration.    

  • Mean cell hemoglobin concentration

    The average concentration of hemoglobin in a given volume (usually 100 ml) of packed red blood cells, obtained by multiplying the number of grams of hemoglobin in the unit volume by 100 and dividing by the hematocrit.  

  • Mass concentration

    The amount of matter of any substance divided by its volume. In the metric system, ρ is defined in kilograms per liter (kg/L).  

  • Myocardial compliance

    The ease with which the heart muscle relaxes as it fills with blood.  

  • Membrane attack complex

    The combination of complement factors C5 through C9 that directly attack and kill the cell membranes of microorganisms during the terminal attack phase of the complement cascade.