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sonorous (adj.)

1610s, from Latin sonorus "resounding," from sonor "sound, noise," from sonare "to sound, make a noise" (from PIE root *swen- "to sound"). Related: Sonorously; sonorousness. Earlier was sonouse (c. 1500), from Medieval Latin sonosus; sonourse "having a pleasing voice" (c. 1400), from sonor + -y (2).

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Definitions of sonorous from WordNet

sonorous (adj.)
full and loud and deep;
a herald chosen for his sonorous voice
Synonyms: heavy
From wordnet.princeton.edu