Abbreviation for purified protein derivative of tuberculin.
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packs per day; paraphenylenediamine; percussion and postural drainage; permanent partial disability; phenyldiphenyloxadiazole; postpartum day; primary physical dependence; progressive perceptive deafness; purified protein derivative
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PPD abbr purified protein derivative
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purified protein derivative (tuberculin); see under tuberculin.Medical dictionary. 2011.