Rupert's drop

noun Ru·pert's drop \ˈrüpərts-\

Definition of Rupert's drop

  1. :  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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a trip made at another's expense

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