achene
/əˈkin/
noun
- A small, dry fruit that does not open to release its seed, with the seed attached to the fruit wall at only one point.
- Botany students examined the structure of an achene under a microscope.
- A sunflower seed is actually an achene with a hard outer shell.
- The dandelion's achene is attached to a fluffy pappus that helps it float in the wind.