Pronunciation: (su-nôr'us, -nōr'-, son'ur-us), [key]
1. giving out or capable of giving out a sound, esp. a deep, resonant sound, as a thing or place: a sonorous cavern.
2. loud, deep, or resonant, as a sound.
3. rich and full in sound, as language or verse.
4. high-flown; grandiloquent: a sonorous speech.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.