sonorous \suh-NOR-uhs; SAH-nuh-rus\, adjective: 1. Giving sound when struck; resonant; as, sonorous metals. 2. Loud-sounding; giving a clear or loud sound; as, a sonorous voice. 3. Yielding sound; characterized by sound; as, the vowels are sonorous. 4. Impressive in sound; high-sounding. Tecumseh... Sign in to see full entry.