The Collaborative International Dictionary of English v.0.48:
Susurrous \Su*sur"rous\, a. [L. susurrus.] Whispering; rustling; full of whispering sounds. [R.] [1913 Webster]WordNet (r) 3.0 (2006):
susurrous adj 1: characterized by soft sounds; "a murmurous brook"; "a soughing wind in the pines"; "a slow sad susurrous rustle like the wind fingering the pines"- R.P.Warren [syn: murmurous, rustling, soughing, susurrous]