allantoin Chem.
(əˈlæntəʊɪn)
[mod. f. allanto-is + -in chem. form. Cf. Fr. allantoïne.]
A crystalline substance, C4N4H603, the nitrogenous constituent of the allantoic fluid.
| 1845 Todd & Bowman Phys. Anat. I. 9 Allantoin, an analogous compound to urea. 1863 Watts Fownes' Chem. (1877) II. 412 Allantoïn..is found in the allantoïc liquid of the fœtal calf..It is produced artificially..by boiling uric acid with lead dioxide and water. |