| Clue | Source | Date |
|---|---|---|
| Small, cylindrical anatomical structure | The Washington Post Sunday | 27 Jun 2021 |
| Tiny hollow cylinder | ||
| Tiny biological channel, as in the kidney | ||
| Capillary, e.g. | ||
| Capillary's cousin | ||
| Capillary's cousin | ||
| Cousin of a capillary | ||
| Capillary | ||
| Small cylindrical structure | ||
| Small pipe |