《女科经纶》女子天癸之至名月信论·
陈良甫曰∶经云女子二七而天癸至,天谓天真之气,癸谓壬癸之水,壬为阳水,癸为阴水,女子阴类,冲为血海,任主胞胎,二脉流通,经血渐盈,应时而下,天真气降,故曰天癸,常以三旬一见,以象月盈则亏,不失其期,故名曰月信。
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