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4-pyridoxic acid

(-pĭr′ĭ-dŏksĭk)
n.
  1. A crystalline acid found in urine that is the principal metabolic product of pyridoxal.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.