piperacillin sodium

[pī-pĕr′ə-sĭlĭn]
n.
  1. A semisynthetic broad-spectrum antibiotic related to penicillin and active against a variety of gram-positive and gram-negative bacteria.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.