/ ˈdʌlsɪt; NAmE / adjective
[ only before noun ] ( humorous or ironic ) sounding sweet and pleasant :
I thought I recognized your dulcet tones (= the sound of your voice) .
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WORD ORIGIN
late Middle English doucet , from Old French doucet , diminutive of doux , from Latin dulcis sweet. The Latin form influenced the modern spelling.