01
Definition
1.
foiba : A deep wide vertical cavity or the swallow point of a river at the beginning of its underground course.
Monroe, 1970
2.
foiba : A natural vertical shaft in soluble rock, tending toward cylindrical shape; it may or may not reach the surface. A dome pit.
Monroe, 1970
02
Frame
| FORM | deep wide vertical cavity |
| tending toward cylindrical shape | |
| vertical shaft | |
| COMPOSITION | in soluble rock |
| LOCATION | may or may not reach the surface |
| FUNCTION | the swallow point of a river at the beginning of its underground course |
03