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We found one dictionary that defines the word eka-protactinium:

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  1. eka-protactinium: Wiktionary

Definitions from Wiktionary (eka-protactinium)

noun:  unbitrium (Ubt), an unsynthesized chemical element with atomic number 123.
noun:  unquadunium (Uqu), an unsynthesized element with atomic number 141.

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