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pacifarin

(pə-sĭfər-ĭn)
n.
  1. Any of various bacterial products that, introduced in small amounts, protect an organism from an infection or disease without killing the infectious agent.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.