Dictionary![]() ![]() un•nil•hex•i•umPronunciation: (yOO"nil-hek'sē-um), [key] —n. Chem., Physics.provisional name for the transuranic element with atomic number 106. Symbol: Unh Also called element 106. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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