noun
- a small cup-shaped structure, especially the cup that holds an acorn or other nut
Usage: botanical
Examples
- The acorn sat snugly in its woody cupule.
- Each hazelnut develops within a leafy cupule.
- The cupule protects the developing nut during growth.
- Oak trees produce acorns with distinctive scaly cupules.
- The botanist examined the cupule’s texture under a microscope.
- Cupules vary in shape and size among different tree species.