Piperacillin Definition
 pī-pĕrə-sĭlĭn 
    noun
  
 A semisynthetic broad-spectrum antibiotic related to penicillin, C23 H26 N5 O7 S, used in its sodium form and active against a variety of gram-positive and gram-negative bacteria.
 American Heritage 
Synonyms: 
  Origin of Piperacillin
pipera(zine) (peni)cillin
From American Heritage Dictionary of the English Language, 5th Edition
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