purified protein derivative of tuberculin pu·ri·fied protein derivative of tuberculin (py&oobreve;r'ə-fīd')
n.
Abbr. PPD Purified tuberculin containing the active protein fraction.
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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a scrap or morsel of food left at a meal. |