Aquiver (adjective):  marked by trembling or quivering

Source: https://www.merriam-webster.com/dictionary/aquiver

From “The Story of an Hour” by Kate Chopin

“She could see in the open square before her house the tops of trees that were all aquiver with the new spring life.”

Here, Kate Chopin uses the word Aquiver to describe how the trees were reacting to the spring weather. This means that the trees were shaking or vibrating in the wind.