In Latin, “susurrus” is the noun for “a whisper,” and “susurrare” is the verb for “to murmur.” In English, the noun is spelled as either “susurrus” or “susurration.” It’s not technically an onomatopoeia (a word created to resemble a sound, such as “plop” or “meow”), but it’s pretty close. A susurrus can be a soft whisper or murmuring sound — it’s what you hear when the wind blows through leaves or when waves crash on the shore.