As a Noun:
1. An egg which has been boiled in its shell until the yolk and the white are hard. English = hard-boiled egg.
2. The rounded object produced by a female bird (and some other creatures) from which a baby bird later emerges. Especially used for the type produced by hens and eaten by people as a food. English = egg.
As a Verb or Adjective:
1. To crack open a hard-boiled egg using an implement such as a knife.