Allantoin

Definitions

  • Webster's Revised Unabridged Dictionary
    • n Allantoin (Chem) A crystalline, transparent, colorless substance found in the allantoic liquid of the fetal calf; -- formerly called allantoic acid and amniotic acid.
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Century Dictionary and Cyclopedia
    • n allantoin A crystalline substance (C4H6N4O3) found in the allantoic fluid of the cow; the nitrogenous constituent of the allantoic fluid. It is also obtained from other sources.
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