susurro
whisper
noun soo-SOO-rroh Rare
Origin: From Latin susurrus, an onomatopoeic word for a soft hum or murmur.
Also means
murmur
Usage Note
Susurro refers to a very soft, quiet sound — either a whispered voice or the gentle rustle of leaves and wind. The verb form is susurrar (to whisper, to murmur). It is slightly more literary than murmullo, though both are widely used for low background sounds.
Examples
"Habló en un susurro para no despertar al bebé."
Natural Translation
She spoke in a whisper so as not to wake the baby.

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