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sparing action in Medicine

sparing action

(spârĭng)
n.
  1. The manner in which the presence of a nonessential nutritive component in the diet lowers an organism's requirement for an essential component.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.