Picture this: It is a quiet, windy day in Autumn. You decide to take a walk in the cold and crisp air. The bright red and yellow leaves from the trees flutter gracefully to the ground. The leaves are scattered asunder by the howling wind that disrupts the trees. You then think to yourself, “What word could I possibly put to that eery sound of the trees rustling in the wind?” Lucky for you, the obsolete psithurism comes from the Greek word for whispering, psithuros-, and the suffix -ism, meaning principle. Until then, I must make like a tree and leaf!