SUBSONIC Scrabble 12 Words With Friends 16 Definition adjective (of speed) less than that of sound in a designated medium. Examples “The noise of the ship was all around her. The faint subsonic rumble of the reactor and drive. (Leviathan Wakes, James S. A. Corey)” See all 104 words you can make from SUBSONIC → 8-letter words Words starting with S Words ending with C ← Unscramble different letters