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stalactite

noun [C]
 
 
/ˈstæl.ək.taɪt/

Definition

a column of rock that hangs from the roof of a cave and is formed over a very long period of time by drops of water containing lime falling from the roofCaves, cracks and crevices
(Definition of stalactite noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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