Plural of dystrophy; multiple instances or types of abnormal degeneration of body tissues or organs.
English pluralization of dystrophy, from Greek 'dys-' + 'trophe.' The plural form is commonly used in medical literature when discussing multiple genetic or acquired degenerative conditions.
There are actually over 30 different kinds of muscular dystrophies, each caused by different genetic mutations affecting different muscle proteins—which is why saying 'muscular dystrophy' is like saying 'cancer'; you have to specify which type.
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