Webster's English Dictionary

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sonorous

so.no.rous \s*-'no-r-*s, -'no.r-; 'sa:n-*-r*s\ aj [L sonorus; akin to L 
   sonus sound] 1: producing sound (as when struck)  2: full or loud in sound 
   : RESONANT  3: imposing or impressive in effect or style  4: having a high 
   or an indicated degree of sonority {~ sounds like  /a:/ and /o./} - 
   so.no.rous.ly av