placenta: [17] Latin placenta originally meant ‘flat cake’. It was borrowed from Greek plakóenta, the accusative form of plakóeis ‘flat cake’, which was derived from pláx ‘flat surface’ (possible relative of English plank). Its application to the afterbirth (originally in the phrase placenta uterīna ‘uterine cake’) is a postclassical development, inspired by the flat round shape of the afterbirth.
placenta (n.)
1670s of plants, 1690s of mammals, from Modern Latin placenta uterina "uterine cake" (so called 16c. by Italian anatomist Realdo Colombo), from Latin placenta "a cake, flat cake," from Greek plakoenta, accusative of plakoeis "flat," related to plax (genitive plakos) "level surface, anything flat," from PIE *plak- (1) "to be flat" (cognates: Greek plakoeis "flat," Lettish plakt "to become flat," Old Norse flaga "layer of earth," Norwegian flag "open sea," Old English floh "piece of stone, fragment," Old High German fluoh "cliff"), extended form of root *pele- (2) "flat, to spread" (see plane (n.1)). So called from the shape.
实用例句
1. The drug can be transferred to the baby via the placenta.
毒品会通过胎盘传给胎儿。
来自柯林斯例句
2. The fat - soluble vitamins ( A, D and E ) seem to be impeded by the placenta.
似乎胎盘阻碍脂溶性维生素 ( A, D和E ) 的通过.
来自辞典例句
3. The virus traverses the placenta and, may seriously interfere with organogenesis.
病毒可透过胎盘, 可能严重妨碍胎儿器官的发生.
来自辞典例句
4. Starch grains present in the embryo sac and placenta are utilized by the embryo.
存在于胚囊和胎座中的淀粉粒为胚胎所利用.
来自辞典例句
5. There is hollow in the thickened wall of a uterus into which the placenta grows.