əˈlantəwə̇n noun
( -s )
Etymology: probably from German, from New Latin allantois + German -in
: a crystalline oxidation product C 4 H 6 N 4 O 3 of uric acid found in the allantoic liquid of cows, in the urine of most mammals, and in many plants (as sugar beets) and used in the treatment of wounds and ulcers