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undetermined nitrogen

(ŭn′dĭ-tûrmĭnd)
n.
  1. The concentration of nitrogen in blood or urine, for example, that can be directly estimated, excluding the nitrogen in such substances as urea, uric acid, or amino acids.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.