词根：place = place, 表示“放, 地方”

displace v. 移位；顶替（dis去掉+place→把放的东西去掉→移位）

replace v. 复职；代替（re重新+place→重新放→复职，引申为“代替”）

replaceble a. 可代替的（replace+able）

replacement n. 替代 ；复位（replace+ment）

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