ruperts drop

listen to the pronunciation of ruperts drop
Английский Язык - Английский Язык
Called also Rupert's ball, and glass tear
by whom they were first brought to England
Rocky
It is remarkable for bursting into fragments when the surface is scratched or the tail broken; so called from Prince Rupert, nephew of Charles I
A kind of glass drop with a long tail, made by dropping melted glass into water