Medical Dictionary

pacifarin pa·cif·a·rin (pə-sĭf'ər-ĭn)
Any of various bacterial products that, introduced in small amounts, protect an organism from an infection or a disease without killing the infectious agent.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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