Crossword clues for the word: HARMONIC The word HARMONIC has appeared as an answer to at least 4 crossword clues on different crossword puzzles. Crossword clues for HARMONIC Showing 1 to 4 of 4 results Clue(s) Ghostly overtone Kind of musical interval Last pick-me-up doesn't start to cause a problem, as it doesn't strike a sour note Pleasing, musically