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Answer for the clue "A transuranic element that has not been found in nature ", 12 letters:
unnilseptium

Word definitions for unnilseptium in dictionaries

WordNet Word definitions in WordNet
n. a transuranic element that has not been found in nature [syn: Uns , element 107 , atomic number 107 ]

Wiktionary Word definitions in Wiktionary
n. (context dated English) bohrium.