allantoin
Webster's Dictionary (1913)
Al·lan′to·in (…), noun
Chemistry A crystalline, transparent, colorless substance found in the allantoic liquid of the fetal calf; — formerly called allantoic acid and amniotic acid.
Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54
Word of the day · Oct 31About this word
nebulousadjective
What does it mean? Question 1 of today’s quiz