[singk-hohl] 
| 1. | a hole formed in soluble rock by the action of water, serving to conduct surface water to an underground passage. |
| 2. | Also called sink. a depressed area in which waste or drainage collects. |
| sink·hole (sĭngk'hōl') n. A natural depression in a land surface communicating with a subterranean passage, generally occurring in limestone regions and formed by solution or by collapse of a cavern roof. |
