Webster's English Dictionary

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stalactite

sta.lac.tite \st*-'lak-.ti-t\ \.stal-.ak-'tit-ik, st*-.lak-\ n [NL 
   stalactites, fr. Gk stalaktos dripping, fr. stalassein to] let drip - more 
   at STALE 1: a deposit of calcium carbonate (as calcite) resembling an 
   icicle hanging  from the roof or sides of a cavern 2: a similar formation 
   of some other material  - sta.lac.tit.ic aj