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probiosis

(prō′bī-ō′sĭs)
n.
  1. An association of two organisms that enhances the life processes of both.
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Related formspro′bi•ot′ic (-bī-ŏt′ĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.