Crossword clues for the word: MASTOID The word MASTOID has appeared as an answer to at least 7 crossword clues on different crossword puzzles. Crossword clues for MASTOID Showing 1 to 7 of 7 results Clue(s) ___ bone (protuberance behind the ear) Bone behind your ear Bone near the ear Bone of the skull. Bone prominence near the ear Bony projection found just behind the ear Skull projection