Definition of sonorous adjective from the Oxford Advanced Learner's Dictionary

 

sonorous

 adjective
adjective
BrE BrE//ˈsɒnərəs//
 
; NAmE NAmE//ˈsɑːnərəs//
 
(formal)
 
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having a pleasant full deep sound a sonorous voice Her clear, sonorous voice is perfect for opera. Word Origin early 17th cent.: from Latin sonorus (from sonor ‘sound’) + -ous.
See the Oxford Advanced American Dictionary entry: sonorous