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| Symbol: Nd; atomic weight: 144.24; atomic number: 60 |
| Symbol: Pu; atomic weight: 242; atomic number: 94 |
allantoin al·lan·to·in (ə-lān'tō-ĭn)
n.
A substance present in allantoic fluid, amniotic fluid, and fetal urine.
A crystalline oxidation product of uric acid produced in vertebrate purine metabolism and used medicinally to promote tissue growth.