| 单词 | placenta |
| 释义 | placenta (once / 8510 pages) n The organ that provides nourishment to developing fetuses before they're born is called a placenta. Most mammals get their nutrients from their mother through the placenta until birth; then they have to look elsewhere... The placenta is commonly called the afterbirth, since it's expelled from the mother's body after a baby is born. A placenta has the unique position of acting as a temporary organ, growing along with the fetus (or fetuses) it feeds, but completely unnecessary after birth. Human placentas are round and flat, and maybe that's why they got their name from the Latin for "cake," placenta. WORD FAMILYplacenta: placentae, placental, placentas, placentation+/placental: placentals, transplacental USAGE EXAMPLESIn the womb, the placenta acts as the fetus’ lungs. Washington Times(Dec 21, 2016) A South Korean study in 2008 said women who received placenta extracts showed improvement in menopausal symptoms linked to reduced oestrogen levels. Reuters(Dec 16, 2016) CDC scientists found that Zika virus RNA persisted in fetal brains and in placentas for more than seven months after the mothers contracted Zika. Washington Post(Dec 14, 2016) 1n the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus Hypo|Hyper afterbirth the placenta and fetal membranes that are expelled from the uterus after the baby is born vascular structure a structure composed of or provided with blood vessels 2n that part of the ovary of a flowering plant where the ovules form Hyper reproductive structure the parts of a plant involved in its reproduction |
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