Psithurism
Etymology
A rare 19th-century English coinage from Greek "psithuros" ("whispering, murmuring"). It captures the specific hush of foliage stirred by wind, a sound with no other single-word name in English.
noun · /SITH-uh-riz-um/
The soft rustling sound of wind moving through trees.
What it names
A rare, exact word for one of nature’s most soothing sounds — the whisper of leaves that most people can only describe by pointing at it.
Example
She left the window open just for the psithurism of the poplars at night.
Related idea
Broader than susurrus, a general soft murmur or whisper of any kind; psithurism is reserved specifically for wind in leaves and branches.