The term "pinnate" refers to a specific arrangement of leaflets or parts in plants. In pinnate leaves, the leaflets are arranged along both sides of a central stem, known as the rachis. This structure resembles a feather, which is why the term is derived from the Latin word "pinna," meaning feather. Common examples of pinnate leaves can be found in plants like rose and ash. In addition to leaves, the term "pinnate" can also describe certain structures in animals, such as the arrangement of fins in some fish. This pattern allows for efficient movement and stability in water. Overall, pinnate structures are characterized by their symmetrical and organized layout, whether in flora or fauna.