D defs.my
Entry 1 sense Webster, 1913

Allantoin

· Al·lan·to·in · IPA
01 n. A crystalline, transparent, colorless substance found in the allantoic liquid of the fetal calf; -- formerly called allantoic acid and amni…
  1. 1.
    A crystalline, transparent, colorless substance found in the allantoic liquid of the fetal calf; -- formerly called allantoic acid and amniotic acid.(Chem.)