dripstone

/ˈdrɪpˌstoʊn/
noun
  1. A rock formation, such as a stalactite or stalagmite, created by dripping water that leaves behind mineral deposits.
    • The cave was filled with beautiful dripstone formations that had grown over thousands of years.
    • Dripstone can be found in limestone caves where water seeps through the rock.
    • Tourists marveled at the tall dripstone columns reaching from floor to ceiling.
  2. A projecting piece of stone or molding on a building that directs rainwater away from the wall.
    • The old church had a carved dripstone above each window to protect the masonry.
    • The architect added a dripstone to the cornice to prevent water damage.
    • Rainwater ran off the dripstone and fell clear of the foundation.