drip·stone /ˈdrɪpˌston/
滴水石
Drip·stone n. Arch. A drip, when made of stone. See Drip, 2.
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dripstone
n 1: the form of calcium carbonate found in stalactites and
stalagmites
2: a protective drip that is made of stone [syn: hoodmold, hoodmould]