'Dripstone' definitions:

Definition of 'dripstone'

(from WordNet)
noun
The form of calcium carbonate found in stalactites and stalagmites
noun
A protective drip that is made of stone [syn: dripstone, hoodmold, hoodmould]

Definition of 'Dripstone'

From: GCIDE
  • Dripstone \Drip"stone`\, n. (Arch.) A drip, when made of stone. See Drip, 2. [1913 Webster]