sta·lac·tite 
(stə-lăktīt′, stălək-)
(stə-lăktīt′, stălək-)n.
An icicle-shaped mineral deposit, usually calcite or aragonite, hanging from the roof of a cavern, formed from the dripping of mineral-rich water.
[New Latin stalactītēs, from Greek stalaktos, dripping, from stalassein, stalak-, to drip.]
sta·lacti·form′ adj.
stal′ac·titic (stăl′ăk-tĭtĭk, stə-lăk′-) adj.
stalactiteCarlsbad Caverns National Park
Carlsbad, New Mexico