lunaria

"ban" in described the blood during the lunaria;

《说文.女部》“姅,妇污也”指的是:月经期间流出的经血;

The ancient people considered the blood,amnionic fluid,lochia and etac as filthy and ominous materials,which will desecrate the inviolability,and drew up much abstinence of lunaria and birth.

古认为从女阴里流出的血液、羊水、是污秽的、不祥的,会亵渎神明,故为之制订种种月经禁忌和生育禁忌。