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noun

stalactite

stuh-LAK-tyt
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Stalactite (noun) means a tapering, icicle-shaped mineral deposit that forms on a cave ceiling as mineral-rich water drips. Example: “Water dripping steadily from the cave roof had built up a cluster of stalactites.”

noun
1
geology A tapering, icicle-shaped mineral deposit that forms on a cave ceiling as mineral-rich water drips.
"Water dripping steadily from the cave roof had built up a cluster of stalactites."
"The guide pointed out a stalactite nearly a metre long hanging from the ceiling."
"Dissolved calcium carbonate slowly built the stalactite, drop by drop."

How to use stalactite

Learner’s notes

In plain EnglishA stalactite is the icicle-like mineral spike you see hanging down from a cave's ceiling.

When to use it

This is a plain, technical geology term with no informal equivalent.

Memory tip

Because stalactite and stalagmite sound so alike, it helps to remember that this word describes the formation hanging from the cave roof, as given in its definition.

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Easily confused with
Common pairings
a stalactite forms a row of stalactites a cave stalactite a stalactite hangs from the roof
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Water dripping steadily from the cave roof had built up a cluster of _____.

Etymology

The word comes from New Latin stalactites, itself based on Ancient Greek stalaktos, meaning dripping or dropping, joined to a Latin ending used for naming stones. That Greek word in turn goes back to a verb meaning to drip or let something drip.

Origin: Greek

Rhymes for stalactite

See all rhymes for stalactite →

Frequently asked questions

What is a stalactite?
A stalactite is a mineral formation, usually of calcium carbonate, that hangs down from the roof of a cave like an icicle.
What are stalactites made of?
They are built up from a mineral, most often calcium carbonate, left behind as water drips slowly from the cave ceiling.
Where do stalactites form?
They form inside caves, growing downward from the roof as mineral-rich water drips over long periods.
What is the meaning of stalactite?
"stalactite" (noun) means a tapering, icicle-shaped mineral deposit that forms on a cave ceiling as mineral-rich water drips.