to boil (an egg) until the yolk and white have become firm or solid.
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How to use hard-boil in a sentence
When they have come to a hard boil, take them off, and when cool enough for your hand, squeeze them in the water.The Ladies' Book of Etiquette, and Manual of Politeness | Florence Hartley
Hard boil three eggs and soak one-half package gelatine five minutes and add to hot liquid.
Stir constantly over a hot fire until it reaches the hard boil stage.
Stir constantly over a hot fire until it reaches the hard-boil stage.
Stir the mixture constantly over the fire until it reaches the hard-boil stage.