Speed-of-sound word crossword clue

Hello crossword solvers! Today let's find the answer to the clue Speed-of-sound word from the USA Today crossword. After we've gathered any other hints from the USA Today crossword puzzle and all possible helpful and relevant information from other sources, we are ready to solve the clue Speed-of-sound word. The answer we found for the clue Speed-of-sound word is:

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The answer has 4 letters: MACH

Last usage in USA Today crossword puzzle.