From Longman Dictionary of Contemporary Englishsoft-boiledˌsoft-ˈboiled adjective DFFan egg that is soft-boiled is boiled long enough for the white part to become solid, but the yellow part in the centre is still liquid → hard-boiled
Examples from the Corpus
soft-boiled• Who steamed fish for him and soft-boiled his eggs and stirred pudding rice into milk?• Lilian's having hers soft-boiled today, aren't you, dear? 