placenta

英 [pl?'sent?] 美[pl?'s?nt?]

暢通詞匯

復(fù)數(shù):?placentas;

placenta 胎盤

來自現(xiàn)代拉丁語placenta uterina,胎盤，來自placenta,面餅，糕餅，來自PIE*plak,平的，來自PIE*pele,展開，放平，詞源同plan,place.因胎盤形如一個平的面餅而得名。

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.: 似乎胎盤阻礙脂溶性維生素 ( A, D和E ) 的通過.

3. The virus traverses the placenta and, may seriously interfere with organogenesis.: 病毒可透過胎盤, 可能嚴(yán)重妨礙胎兒器官的發(fā)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為胚胎所利用.

5. There is hollow in the thickened wall of a uterus into which the placenta grows.: 在變厚的子宮壁上有一凹處,胎盤就長在里面.