Prince Rupert's drop
noun
- a pear-shaped bubble of glass with a long tail, made by dropping melted glass into water. Prince Rupert's drops have the property, due to internal strain, of disintegrating explosively when the tail is broken off or the surface scratched.鲁珀特玻璃泡（将玻璃融液滴入水中制成的长尾梨形玻璃泡, 因内应力的缘故, 鲁珀特玻璃泡具有尾部折断或表面划破引起爆碎的特点）。
词源
late 17th cent.: so named because introduced to England by Prince Rupert of Germany.