Etymology: < Hellenistic Greek ψιθύρισμα (also ψιθυρισμός) (noun) whispering < ancient Greek ψιθυρίζειν to whisper
N.E.D. (1909) gives the headword form as psithurism with the pronunciation as (psi·þiŭriz'm)
Whispering; a whispering noise.
"A murmurous laughter of mocking winds arose at times, and rustled on, and died away into the psithurisma of Theocritus."(OED)
OED Online. September 2013. Oxford University Press. 24 November 2013 .
Taliesin. Aspen leaves. N.d. Stock Image, N.d. Morguefile. Web. 1 Nov. 2012.