susurrant adj.

"a whispering, a murmur," c. 1400, susurracioun, from Latin susurrationem (nominative susurratio), noun of action from past-participle stem of susurrare "to hum, murmur," from susurrus "a murmur, whisper." This is held to be a reduplication of a PIE imitative *swer- "to buzz, whisper" (source also of Sanskrit svarati "sounds, resounds," Greek syrinx "flute," Latin surdus "dull, mute," Old Church Slavonic svirati "to whistle," Lithuanian surma "pipe, shawm," German schwirren "to buzz," Old English swearm "a swarm").