caulicle
/ˈkɔlɪkəl/
noun
- The small stem of a plant embryo or seedling, especially the part that develops into the main stem.
- Under the microscope, the caulicle was visible as a tiny green shoot.
- The caulicle pushes upward through the soil as the seed germinates.
- Damage to the caulicle can prevent the seedling from growing properly.