MDH
- (S)-mandelate dehydrogenase
- List of aviation, avionics, aerospace and aeronautical abbreviations
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- Malate dehydrogenase
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- Mater Dei Hospital
- Methanol dehydrogenase (cytochrome c)
- Methylenedioxyhydroxyamphetamine
- Milton District Hospital
- Minnesota Department of Health
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- Mälardalen University College
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- Southern Illinois Airport