stal·ag·miteBrE/ˈstæləɡmaɪt/NAmE/stəˈlæɡmaɪt/nounapieceofrockpointingupwardsfromthefloorofacave, that is formed over a long period of time from drops of water containing lime(= ahollowplaceunderground), thatisformedoveralongperiodoftimefromdropsofwatercontaininglimethatfallfromtheroof石笋(向上生长)