placenta

英[plə'sentə] 美[plə'sɛntə]

近义词

反义词

复数: placentas;

placenta 胎盘

来自现代拉丁语placenta uterina,胎盘，来自placenta,面饼，糕饼，来自PIE*plak,平的，来自PIE*pele,展开，放平，词源同plan,place.因胎盘形如一个平的面饼而得名。

placenta: 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.

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.

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.

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.

5. There is hollow in the thickened wall of a uterus into which the placenta grows.: 在变厚的子宫壁上有一凹处,胎盘就长在里面.