pacifarin

[ pə-sĭfər-ĭn ]

n.

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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What does “vacillate” mean?
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.