. 1. In games, a zero; a score or record of naught; -- so named in allusion to the egglike outline of the zero sign 0. Called also duck egg. [ Slang ] [ Webster 1913 Suppl. ]
2. A bump on the skin caused by a blow, especially one on the head. [ PJC ]
[へいだん;へいたん;べいだん, heidan ; heitan ; beidan] (n) type of pastry of the Heian period made of duck or goose eggs mixed with vegetables boiled and wrapped in mochi which is then cut into squares