stalagmite
noun /ˈstæləɡmaɪt/
/stəˈlæɡmaɪt/
- a piece of rock pointing upwards from the floor of a cave (= a hollow place underground), that is formed over a long period of time from drops of water containing lime that fall from the roof
石笋（向上生长） 词源late 17th cent.: from modern Latin stalagmites, from Greek stalagma ‘a drop’, based on stalassein ‘to drip’.