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Rupert's drop
noun
Ru·pert's drop
\ˈrüpərts-\
Definition of Rupert's drop
: a congealed blob of glass formed by dropping melted glass into water and setting up such residual stresses that the globule explodes violently when the surface is scratched or a piece broken off
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Origin and Etymology of rupert's drop
after Prince Rupert of Germany †1682 who first brought it to England to his uncle Charles I of England
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