A white, crystalline oxidation product, C4H6N4O3, of uric acid that is the metabolic end product of purine oxidation in some mammals and is used in some dermatological preparations as an astringent. It is also found in allantoic fluid, amniotic fluid, and fetal urine.
Origin of allantoinallanto(is) + –in.
- (biochemistry) A diureide of glyoxylic acid, used in various pharmaceutical and cosmetic products; or a derivative of this compound
From allantois, an amniote embryonic excretory organ in which it concentrates during development in most mammals