Rootlet (noun)

1. A small root.
2. A tiny part of a root.

Origin:

Late 17th century (in rootlet (sense 1)): from root + -let.

Examples:

1. The rootlets had started to grow from the main root of the plant.
2. She studied the rootlets under a microscope to see how they absorb water and nutrients.
3. The rootlets are an important part of the plant's system for obtaining food.
4. The rootlets on the old tree had started to dry up due to lack of water.
5. Scientists believe that rootlets play a crucial role in the growth and development of plants.