A-

Prefix indicating the absence or depletion of something: for example, aphagia (not eating) or aphonia (voiceless). The related prefix an- is usually used before a vowel, as in anemia (without blood) and anoxia (without oxygen).

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Usman Ahmad, MD

Usman Ahmad, MD, is a thoracic surgeon in the Department of Thoracic and Cardiovascular Surgery at t