We found one dictionary that defines the word tennessium:

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1. tennessium: Wiktionary

Definitions from Wiktionary (tennessium) ▸ noun:  A rejected name for tennessine ▸ Words similar to tennessium ▸ Usage examples for tennessium ▸ Idioms related to tennessium ▸ Wikipedia articles (New!) ▸ Popular adjectives describing tennessium ▸ Words that often appear near tennessium ▸ Rhymes of tennessium ▸ Invented words related to tennessium