词根词缀：placento-, placent-, placenta-
【来源及含义】Latin: flat cake; cakelike mass, especially the uterine organ that connects the mother to the child by way of the umbilical cord
【同源单词】fetoplacental, incarcerated placenta, placentotherapy, thermoplacentography, zonoplacental
词根词缀：zono-, zon-, zoni-
【来源及含义】Greek > Latin: girdle, girded garment
【相关描述】An area with definable boundaries, especially an encircling area.