Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A yellowish-white, crystalline purine base, C5H4N4O2, that is a precursor of uric acid and is found in blood, urine, muscle tissue, and certain plants.
  • noun Any of several derivatives of this compound.

from the GNU version of the Collaborative International Dictionary of English.

  • (Physiol. Chem.) A type of purine obtainable as a white microcrystalline powder, C5H4O2N4, present in muscle tissue, in the liver, spleen, pancreas, and other organs, and also in urine (in small quantities) and some urinary calculi, and in the juices of certain plants; -- so called because it leaves a yellow residue when evaporated to dryness with nitric acid. It is also present in guano. Xanthine is closely related to uric acid.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry Any of a group of alkaloids, that include caffeine, theophylline, and theobromine as well as the parent compound, a precursor of uric acid found in many organs of the body.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun crystalline oxidation product of the metabolism of nucleoproteins; precursor of uric acid; found in many organs and in urine

Etymologies

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