n. [ Allantoin + oxalic, as containing the elements of allantion and oxalic acid. ] (Chem.) An oxidation product of uric acid. It is of a pale reddish color, readily soluble in water or alcohol. [ 1913 Webster ]

n. (Chem.) A combination of alloxanic acid and a base or base or positive radical. [ 1913 Webster ]

a. (Chem.) Of or pertaining to alloxan; -- applied to an acid obtained by the action of soluble alkalies on alloxan. [ 1913 Webster ]

n. (Chem.) A substance produced by acting upon uric with warm and very dilute nitric acid. [ 1913 Webster ]