卵字，见《说文·卵部》：“卵，凡物无乳者卵生，象形。”在这里许慎的意思是说，卵是禽卵的卵。可是，古文字如湖北江陵出土的楚简和云梦睡虎地出土的秦简以及小篆的卵字①均与禽卵形象不符。后世学者也都为之圆说，如段玉裁说：“卵未生则腹大，卵阴阳所合，天地之杂也，故 Eggs, see “Said the text oval”: “Eggs, everything non-dairy oviparous, pictographic.” Xu Xu here means that the eggs are egg eggs. However, the ancient writings such as the bamboo slips unearthed in Jiangling of Hubei and the bamboo slips unearthed in the Yunmeng Nessie Tigers and the egg characters of Xiaozhuan ① are all inconsistent with the image of poultry eggs. Later scholars have also said round, such as Duan Yu cut said: "The eggs are not born abdomen, eggs yin and yang, heaven and earth also complex, so