galactite
noun
ga·lac·tite
gəˈlakˌtīt
plural -s
: an unidentified soluble stone possibly of calcium nitrate whose milky solution gave rise to many legends and superstitions in medieval times
Word History
Etymology
Middle French or Latin; Middle French galactite, from Latin galactites, from Greek galaktitēs (lithos) stone that makes water milky, from galakt-, gala milk
First Known Use
15th century, in the meaning defined above