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| Symbol: Nd; atomic weight: 144.24; atomic number: 60 |
| Symbol: Hf; atomic weight: 179.49; atomic number: 72 |
arachidonic acid ar·a·chi·don·ic acid (ār'ə-kĭ-dŏn'ĭk)
n.
An unsaturated fatty acid found in animal fats, that is essential in human nutrition and is a precursor in the biosynthesis of some prostaglandins.