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parastasis

(păr′ə-stāsĭs, pə-răstə-sĭs)
n.
  1. The relationship among causal mechanisms that can compensate for, or mask defects in, each other.
  2. In genetics, a relationship between non-alleles considered to be a form of epistasis.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.