WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / S / sonic barrier sonic barrier noun 4 syllables 13 letters Scrabble 16 WWF 19 Definitions noun the increase in aerodynamic drag as an airplane approaches the speed of sound sound barrier Look “sonic barrier” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →