placenta

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【词性】：n．

【释义】：

胞衣，胎盘；(植)胎痤

accessory placenta副胎盘

adherent placenta粘连胎盘

allantoic placenta尿囊胎盘

annular placenta环状胎盘

dried human placenta紫河车(中药)

retention of placenta胞前不下(或称息胞)

Retention of placenta is the case that the placenta is not delivered spontaneously long after the delivery．息胞指胎儿娩出后，较长时间胎盘仍不能自动娩出。