Etymology
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stalactite (n.)

"hanging formation of carbonite of lime from the roof of a cave," 1670s, Englished from Modern Latin stalactites (used 1654 by Olaus Wormius), from Greek stalaktos "dripping, oozing out in drops," from stalassein "to trickle," from PIE root *stag- "to seep, drip, drop" (source also of German stallen, Lithuanian telžiu, telžti "to urinate") + noun suffix -ite (1). Related: Stalactic; stalactitic.

updated on January 25, 2018

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Definitions of stalactite from WordNet

stalactite (n.)
a cylinder of calcium carbonate hanging from the roof of a limestone cave;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.