stalagmite
/stəˈlæɡˌmaɪt/
noun
- A rock formation that rises up from the floor of a cave, formed by dripping water that leaves behind mineral deposits.
- A stalagmite can eventually meet a stalactite to form a column.
- The stalagmites on the cave floor grew slowly upward over thousands of years.
- Visitors were careful not to step on the delicate stalagmites.