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Reference for someone who's really in their element?

Looking for the answer to the USA Today Crossword clue “Reference for someone who's really in their element?”? The solution is PERIODICTABLE, a 13-letter word. This clue was most recently seen in the June 24, 2026 (Wednesday) USA Today Crossword. Tap any date below to open that day's complete puzzle, or search another clue from the bar above.

Answer
PERIODICTABLE