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plural stalagmites
(geology) A secondary mineral deposit of calcium carbonate or other mineral, in shapes similar to icicles, that lies on the ground of a cave. quotations
In one place, near at hand, a stalagmite had been slowly growing up from the ground for ages, builded by the water-drip from a stalactite overhead.
1876, Mark Twain [pseudonym; Samuel Langhorne Clemens], chapter XXXIII, in The Adventures of Tom Sawyer, Hartford, Conn.: The American Publishing Company