资料来源 : pyDict

胎盘形; 胎座状的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Placentiform \Pla*cen"ti*form\, a. [Placenta + -form.] (Bot.)
   Having the shape of a placenta, or circular thickened disk
   somewhat thinner about the middle.