The Collaborative International Dictionary of English v.0.48:
Susurrant \Su*sur"rant\, a. [L. susurrans, p. pr. from susurrare to whisper.] Whispering. [R.] "The soft susurrant sigh." --Poetry of Anti-Jacobin. [1913 Webster]WordNet (r) 3.0 (2006):
susurrant adj 1: making a low continuous indistinct sound; "like murmuring waves"; "susurrant voices" [syn: murmuring, susurrant, whispering]