Dictionary  un•nil•pen•ti•umPronunciation: (yOO"nil-pen'tē-um), [key] —n. Chem., Physics.provisional name for the transuranic element with atomic number 105. Symbol: Unp Also called element 105, hahnium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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