Definition of century egg in English:

century egg

noun

  • An egg that is traditionally prepared by preserving it in a mixture containing charcoal and quicklime for several weeks or months, eaten as a delicacy in China.

    ‘their century egg is served as an appetizer’

Origin

1920s: from century + egg, possibly as a reference to the length of the preserving period, or to the length of time the egg supposedly remains fit for consumption.