lunaria

"ban" in described the blood during the lunaria;

《说文.部》“姅,妇污也”指是:月经期间流出经血;

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.

古认为从流出血液、羊水、胎衣等是污秽、不祥,会亵渎神明,故为之制订种种月经禁忌和生育禁忌。